No biome is left out. Now you can have every grass color that the biomes have to offer. GUI is the same as the last, but the difference is that there is a bigger list.
For you to update the code,
1. You must credit Sethbling for the original code, and me, for the biome adding.
2. This must be 2 versions behind(like this is on 1.7.10, and 1.9 is out).
3. There must be new biomes in the game.
Not required, but if you want, link to the original post, so it will be easy to find.