A diamond block! One of the rarest random blocks set to spawn. Its theoretical probability of appearing is .005% or 1 time every 20,000 blocks.
White-Meat Spawning
Slime Spawner
Some 1.5 block awesomeness :)
Nether wart on some soul sand.
Shows use of Multiverse creating skygrid worlds using UltimateSkyGrid as a generator.
Change block probability via the plugin's config file