Biome Mod
Bayou - Tall, vine-covered trees loom over a swampy area with murky water and logs sticking up from the ground.

Bog - Dead trees over a muddy landscape, with brown, murky water.

Deadlands - Dark skies are cast over this obsidian covered hell on earth where mobs can spawn during the day, and the water is as red as blood.

Flower field - A flat, green field covered in tons of flowers.

Maple Forest - A peaceful, colorful forest of red, orange, and brown trees, with sparse cedar trees. Fallen leaves cover the landscape.

Mystic Forest - A mysterious, magical forest filled with plants, purple water, and the occasional giant mushroom.

Prairie - Flat grassland with nothing but thick grass and wheat grass.

Tropical Rainforest - Broadleaf trees cover a lush, green land where melons have a chance of spawning.

Wetlands - A swampy forest with dark blue water and slimy green grass.

Wheat Field - Rolling hills of grain provide magnificent scenery here. Wheat does not drop anything, to prevent it from being overpowered.
http://www.reddit.com/r/Minecraft/comments/qs8ox/so_i_added_10_new_biomes_over_the_past_2_days/