Here's just another Knuckles stamp. I have no clue what the source is from, but it looked cool. It is part of a group of two shots with 3 characters in each.
EDIT: It's from Sonic Chronicles (I would have never guessed that. Why isn't the game this cool?)
He looks so awesome there!
I somehow ended up developing a crush on him a few years ago so I'm watching Supernatural to shift the crush over onto Sam or Dean Winchester instead :I