Well, bigger spins. Bigger corks, of course you could try dubs (than you will get a LOT of variation). But try bigger mistys also, bigger rodeos like 7's or 9's. Do different grabs. Focus more on style instead of just landing.
I mean plain and simple, just take the regular back, front, flat, rodeo, misty, bio etc. flip/rotation and try bigger things with them, such as different grabs or bigger spins, and focus on style...
Anyother thing is try stuff with a foam skateboard thing under your feet, adds some more creativity if you get that* bored.