We have a customer who does his own customs - the two pictures with this post are just two of the ones he's done. Pictured are a customized Batman (Hush Batman and Punisher. Body: DCSH Batman with black wash. Cape: Leather) and "Dark Knight" Joker (Head: Sculpted Aragorn. Body: DCSH Clark Kent.) and a Cable (head Cable fig, body from a Punisher fig) - click to enlarge.
Personally, I don't have the time to do something like this. But, they do look cool when they're finished.