The flash game would be about members that build and wire bombs to whatever they build.
Example a member could build a few buildings or bridges .. which they could save and then blowup wth pre designed or configured bombs on our Database. They could maybe enter an interger for the amount of pressure of size of explosion needed to take down this builidng or whatever else.
The drawings would be down live with a toolbar setup with pencil , eraser , etc on the flash.
The point is to have fun building something only watch to take it down ... something like playing cards :-) except with this when u save you can try different ways on blowing up your art.

Now how the drawings respond or physics is were you come in and need to think that out. ONe idea would when creating the art ,,

I want also members to be allowed to share their creations and allow others to be able to blow them up .. they all can be uploaded to our sever .. I would need an option on the flash to save and upload or load.