Project Spark has shown us four Biomes so far that can be painted with the Biome Brush.
Woodlands Biome
The woodlands biome includes lush trees and jumpy squirrels.
Arctic Biome
The arctic biome includes beautiful ice formations and snow covered rocks.
Desert Biome
The desert biome consists of dry rocks and prickly cacti.
A fourth biome is the Alien Asteroid Biome.