Install ModLoader 1.2.4
Files from Random Biomes v1.1 place in the folder minecraft.jar

Mod adds a few new biomes, where you can find interesting Built.
Wasteland Biome:

Gravel Biome:

Pumpkin Biome:

Sponge Biome:

download mod

14 Days Free Access to USENET
Free 300 GB with 10 GB High-Speed