Some of these are pretty cool...
 
Instructions on how to create and input your own can be found via the the link below, alternatively you can download these skins.  
 

those are pretty awesome.... love the batman beyond and zur-an-arrh ones

I like the last red and black number, that looks dark and sinister. 
 
I also like Captain America, but only because it's so wrong it's right.

Black and golden one is pretty sweet.
Then again the costume's skin is fine, I take exception to Batman's proportions.

" Black and golden one is pretty sweet. Then again the costume's skin is fine, I take exception to Batman's proportions. "

Changing the diffuse textures and not even touching the normal map, let alone the model is pretty lame IMO.  You see that batman emblem on his chest being shiny even when it shouldn't be this way.

The Green Lantern one is pretty cool. Is the PC version for GFWL?

I'm assuming these are mods.... that makes me sad since I went with the console for Batman.

Definitely like seeing the classic Batman costumes as well as the Batman Beyond stuff.  Very nifty.