Replace the world with diamond blocks or devour every piece of gravel in sight with the new bacteria mod. In this mod, players can create a bacterium colony and can either have it replace blocks with a blocktype of their choosing, or destroy every block of one type in their path.
Simply activate the bacterium with a redstone signal and release them onto the world. With only two ways of stopping the bacterium spread, a bacteria jammer that destroys any colony a player strikes with it, and a bacteria jammer block that destroys any colony that touches it, players decide what survives the infestation.
Downloads for Bacteria Mod 1.8.1/1.7.2, 1.6.4, 1.6.2
Downloads for 1.8.1 & 1.8 coming soon... check back later