What I was thinking is something like the mob spawners but something that displays the items that you can craft and creatures only in glass. When that item/creature is on top of this block it sends out a redstone on signal. I figure it would have to work something like Risugami's spawner gui mod where you set it down and and click it to bring up a gui screen where you can select one item/creature. It be awsome if it spun in glass block like spawners but not necesarry dont care how its crafted but this would be cool.
redshroom is redstone