Ore Generator is a plugin that I have created which allows you to determine which blocks may spawn inside a cobble generator. For example, you could configure the spawn rates of different ores which would be generated inside of your players' cobble generators.

This is a necessary plugin for any Skyblock server.



Example configuration:
(Block material names found here: http://www.minecraftinfo.com/idnamelist.htm)

All chances are relative. eg. COBBLESTONE: 10 and STONE: 1 means Cobblestone is 10 times more likely than Stone to spawn, or it has an 10/11 chance.