I built an Ender Ender (yes, Etho's design) in the End - a gravity grinder. ATM it's purely an Ender pearl farm, but once I expand it out a few stages, I'll raise the floor 1 block and make it an XP grinder as well.
I'm building it legit, so contributions of pistons, redstone torches, snow blocks, and cobblestone are appreciated. I used 64 snow blocks, 64 pistons, and 128 redstone torches for the smallest, inner ring of spawning area. The next ring will require 160 snow blocks & pistons, and 320 redstone torches. The 3rd ring (and probably the final one due to costs) will require 256 snow blocks & pistons, and 512 redstone torches.
Contributions can be left in the double-chest in the center of the Ender Ender (enter the end, and follow the 1m-wide path away from the island). If you contribute, feel free to take a stack of Ender pearls from that chest - it's got like 4-5 stacks. Otherwise, hang around and collect your own dang pearls.
