I love the colour combination of the dark and mysterious black, the stone grey and the eerie blue/teal. The silver bats fit right in, and I think this will make a gorgeous piece for any comic fan or bat lover :-)
I also ordered some golden bats, and I plan on making a Batwoman yarn. I already blended the fibres, so I'll start this some time soon.
I have many more ideas, some of which I already started to put into action. I spun a Necromancer yarn with skulls and bones in it, and a Polyjuice Potion yarn. I already carded many batts for more yarns, so keep your eyes open! :-)