Simply adds the biomes to world generation that use vanilla blocks to make a few things easier to obtain.
Description
Adds the Rustic Hills, Rustic Wilds, and Rustic Woods biomes that make getting spruce, burch, and oak a little easier. They also provide access the the flowers usually found in the Meadows.
Each of the three biomes should take up only 1% of your world on average, so shouldn't overrun the vanilla biomes during world generation. These biomes also tend to be found bordering the Savana Biomes.
Since the biomes are created using vanilla blocks, there would not be any conflicts with any other mods.