Nothing? Other than you go to Nueva York and stare out of Miguel's living-room window since it's gotta be like 200 floors up or something, and get nose prints all over his window.
Sometimes you get changed to match the world through the door, though. One door turned us all into merpeople, since it was like an ocean world. It made me be like a shark, so that was kinda cool. And a different door turned us into ponies.