Darwin Ortiz has a cool packet trick style effect where he brings 4 of a kind, using the gimmick, called Back Off.
"The Trick that Fooled Houdini" that ends with a colour change can be found on Garrett Thomas DVD's.
However, I recommend you use your imagination. Understand the versatility of the card, and perhaps your imagination can help you see something new.
I always loved the premise of Garcia's routine, but never liked the handling...or the crazy edit when he does the ego change, because it flashed...yeah, it is that obvious when you do it too. Sorry DG, always bothered me you ended dirty - great idea, poor construction...yet, I struggle to come up with anything better myself, but I will continue to work on it. Although, that idea sparked some great stuff, thanks...oh, and by great stuff, I don't mean pot...okay, I do.
Lastly, I feel like some cookies, I mean double backer fun.
PS - I heard Houdini had a great effect, where he had a card selected, card shuffled face up and face down with the card lost in the middle. He then threw an entire deck into water off a boat...and all the cards would be face down, floating, but one...the selection, face up. Pretty sick idea. Winka winka. If you get the winka winka...this could spark a few uses without water tossing them.
Not my fav of the standards gimmicks...but certainly cool!