This is an example of environment concept art for a game. This is concept art for Batman : Arkham Asylum. I really like the look of this concept art because it places you in the perspective of the enemies rather than Batman.
This funny piece of geek art created by Deviant Art artist Agustinus, features Superman striking a pose while wearing Batman's cape and cowl. I love Batman's hand reaching in from out of frame to snatch it back.