With Mars just released, and there not being any Mars-Unique biomes, I thought I would share my ideas. Carbon Snow Biome- As we all know, it will likely never snow water on Mars. But, it does (rarely) snow carbon on Mars. A martian biome taking advantage of this phenomenon whould be interesting. Perhaps a combination of H2O ice and carbon ice along with mars surface stone should generate on the surface. Dried Riverbed- A biome similar to the current martian surface, but with "Moist Stone" as the biome's filler block. Moist stone should be tillable. Spawn rates of Sludeling Eggs could be increased here. Mars- Standard world generation that we have now. Water Colorizer- Any biome can have a specific water color set, any water on mars should be colorized slightly red.