Everyone may add the following power to their repertoire.
Do Something Cool
You do something cool.
Free Action (Special)
Trigger: You have a cool idea you'd like to try.
Effect: You do something cool.
Special: This power recharges when you think of something cool.
I'm a big believer in saying yes, in enabling player ideas. I don't feel that this needs to mean throwing the rules out the window, or not retaining a necessary amount of DM control, so the above power is a guideline and reminder I use in my face-to-face game.
Basically, this power is for cool things that you think your character should be able to attempt, but doesn't necessarily have the powers or feats to accomplish. It's an encounter power, so it's not intended for constant use the way a feat or at-will power is.