This is a map I made for my private server using World Painter. It has a giant volcano in the center, which you spawn in. Around it and separated by rivers are the following biomes: jungle, plains, snow plains, taiga, forest, dessert, mountains, and swamp. It is meant for an admin to tp a single person to each biome to survive there and trade with people in other biomes.

World Painter:
http://www.minecraftforum.net/topic/231255-worldpainter-new-map-creatorgenerator-work-in-progress/
http://www.worldpainter.net/