Here are the wide range of planet types, sizes, planetary abilities, as well as a rather large list of planetary bonuses that can be discovered from the DS mod team. I believe Stant 123 updated them recently.
I say stuff a 'ton' of planetary bonuses into the B5 mod so you never know which one you're going to get. It adds to the excitement of the universe you are exploring and playing in each time.
http://sinsdistantstars.wikia.com/wiki/Planets_-_Abilities_and_Bonuses
I copied and pasted them here for ease of reference as well. Feel free to place a B5 spin with B5 names, tweaking as necessary to make them significantly unique, and go to town. This is intended as inspiration for what is possible with planetary bonus abilities, not to be copied word for word without permission from the DS mod team.
Exploration Bonuses
A
Abandoned Smugglers Base - Tax income +1, trade income +40%
Active Smugglers Base - Tax income -2, trade income -60%
Adhesive Resin - Trade income +25%, development build cost +10%
Ancient Planetary Shield (Damaged) - Planet health +700
Ancient Planetary Shield (Working) - Planet health +2000
Automated Defense Droids - Max population -100, Population growth -100%
B
Beautiful Population - Culture spread rate +40%, trade income +20%, population growth +30%
Black Market - Trade income +500%
Breathable Atmosphere - Max pop +200, development build cost +50%, Development bult rate +50%, population growth +20%
Brilliantly Designed Buildings - Max population +250, planet health +500, population growth +20%
C
Caustic Atmosphere - Max population -15, development built cost -20%
Completely Hollow Core - Gravity well radius -66%
Completely Overgrown - Max population -100, planet health +800, development build rate -90%, population growth -50%
Conductive Mantle - Culture spread rate +25%
Constant Flooding - Max population -20, development build cost -40%, development build rate -40%
Construction Droids - Structure build rate +50%, development build rate +100%, extra constructors +3
Corrosive Atmosphere - Planet health -100, trade income -1, development build cost -50%
D
Deadly Secret - Max population -1000, planet health -10000
Dense Canopy - Planet health +600
Dense Jungle - Max population -10, development build rate -75%, population growth -30%
Dense Molten Core - Gravity well +33%
Diseased Planet - Max population -20, tax income -2, trade income -50%, structure build rate -100%, development build rate -100%, population growth -90%
E
Entertainment Hub - Culture spread rate +10%, tax income +1/sec
Expert Agrarian Society - Trade income +10%
Expert Metal Miners - Metal extraction rate +50%
Expert Crystal Miners - Crystal extraction rate +50%
Extremely Valuable Timber - Trade income +50%
F
Floating Fauna - Max population -5, trade income +30%
Floating Islands - Max population +25
Foul Smell - Culture spread rate -20%, max population -20, trade income -10%, development build rate -30%, population growth -10%
Fresh Water Oceans - Max population +50, trade income +75%, population growth +30%
Frequent Meteorites - Max population -20, metal extraction rate +30%, crystal extraction rate +30%
Friendly Religious Population - Culture spread rate +60%, population growth +20%
Frozen Gas Core - Max population +5, Planet health +300
Frozen Over - Dev build rate -75%
G
Galactic Trade Center (Moon) - Tax income +1/sec, trade income +30%, population growth +20%
Galactic Trade Center (Dwarf) - Tax income +2/sec, trade income +30%, population growth +20%
Galactic Trade Center (Normal) - Tax income +3/sec, trade income +40%, population growth +20%
Galactic Trade Center (Huge) - Tax income +4/sec, trade income +50%, population growth +20%
Gas Storms - Max pop -5, Planet health -200, pop growth -25%
Geothermal Hot Spots - Logistic slots +4
Giant Fungi Forests - Max population -10, trade income +40%, development build cost -20%
Gravitational Anomoly - Logistic slots -4, tactical slots -5, gravity well radius -100%
Gravitational Boon - Logistic slots +4, tactical slots +5, gravity well radius +100%
H
Habitable Cavern System - Max population +15, planet health +500
Helium Rich Atmosphere - Trade income +25%
Hideous Population - Culture spread rate -20%, trade income -50%, population growth -30%
High Security Protocols - Tactical slots +5, trade income -20%
Hostile Religious Population - Culture spread rate -30%, tax income -1
Huge Comm Station Array - Culture spread rate +100%, tactical slots -8
Huge Crystal Processing Plant - Trade income +10%, crystal extraction rate +200%
Huge Herds of Cattle - Max population +40, tax income +0.5, trade income +20%, population growth +20%
Huge Metal Processing Plant - Trade income +10%, metal extraction rate +200%
I
Impure Crystal - Trade income -10%, crystal extraction rate -60%
Impure Metal - Trade income -5%, metal extraction rate -60%
Indigenous Carnivores - Max population -20, development build rate -20%, population growth -60%
Indigenous Satellites - Culture spread rate +20%
Industrial Wasteland - Culture spread -30%, metal extraction rate +30%, crystal extraction rate +30%
Ionic Storms - Max population -20, trade income +10%
K
Kalanite Deposits - Trade income +20%
M
Massive Pure Glaciers - Trade income +30%
Mega Fauna - Max population -15, trade income +25%
Militaristic Population - Planet health +1000, logistic slots -4, tactical slots +10, tax income -2, trade income -20%, extra constructors 1
Moon - Logistic slots +4, gravity well radius +25%, structure build rate +10%
Moons - Logistic slots +8, gravity well radius +50%, structure build rate +20%
N
Natural Radiation - Development build rate -40%, population growth -80%
Natural Thermal Lift - Structure build rate +25%
O
Old Military Outpost - Planet health +1000, tactical slots +10, extra constructors +1
Orbital Construction Specialists - Logistic slots +4, tactical slots +4, structure build cost +30%, structure build rate +50%, extra constructors +2
P
Penal Colony - Structure build cost +20%, structure build rate -30%
Perfect Holiday Destination - Culture spread rate +100%
Persistent Dust Storms - Population growth -25%
Pharmaceutical Flora - Trade income +20%, population growth +20%
Planetary Construction Specialists - Planet health +200, development build cost +30%, development build rate +50%
Planetary Insurgency - Culture spread rate -20%, planet health -150, tax rate -2, trade income -30%, metal extraction rate -50%, crystal extraction rate -50%, structure build cost +20%, development build cost +20%, structure build rate +60%, development build rate +60%, population growth -30%
Planetary Revolt - Culture spread rate -10%, planet health -100, tax rate -1, trade income -10%, metal extraction rate -20%, crystal extraction rate -20%, structure build rate +30%, development build rate +30%, population growth -10%
Pleasent Rodents - Culture spread rate +40%, trade income +20%
Plundered Booty - Tax income +3.5
Porous Core - Gravity well radius -33%
Precious Stones - Culture spread rate +20%, logistic slots +4, trade income +50%
Priceless Timber - Culture spread rate +20%, trade income +80%
R
Raiders Outpost - Metal extraction rate +20%, extra constructors 1
S
Scented Plants - Culture spread rate +20%, trade income +20%
Seismic Activity - Population -20, planet health -100, tax -1, development build cost -30%, development build rate -10%
Signal Interference - Culture spread rate -20%
Slaves - Trade income +10%, structure build cost -30%, development build cost -50%, development build rate +20%
Solar Energy Harvesting - Max population +15
Space Ponies - Space Ponies! (No bonus except for achievement)
Spice Trade - Culture spread rate +5%, trade income +10%
Stable Debris Field - Trade income +20%
Storm Ridden Planet - Max population -50, development build cost +20%, development build rate -20%, population growth -40%
Strong Building Materials - Planet health +500, trade income +10%, development build rate -20%
Submerged Colony - Max population +140, planet health +800
Subterrainian Colony - Max population +80, planet health +1500
Super Dense Core - Gravity well radius +66%
Super Pure Crystal - Crystal extraction rate +200%
Super Pure Metal - Metal extraction rate +200%
T
Thaw Cells - max pop +25
Thick Atmosphere - Planet health +1200
Tibanna Gas - tactical slots +2, trade income +5%
Toxic Fallout - Max population -30, population growth -25%
Traces of Oxygen - Max population +50, population growth +20%
Tundra Farms - Max population +25
U
Unstable Ground - Development build cost +50%, development build rate -20%
V
Valuable Timber - Trade income +30%, development build cost -10%
Vermin Infestation - Tax income -1, trade income -30%, development build cost +20%, development build rate -20%
W
War Torn Planet - Culture spread rate -40%, planet health -200, logistic slots -4, tactical slots -6, trade income -30%, metal extraction rate -20%, crystal extraction rate -20%, structure build rate -40%, development build rate -20%, development build cost +60%, population growth -50%
Weapons Test Facility - Max population -20, tactical slots +8
Well Designed Buildings - Max population +100, planet health +200