I remember one of the older ERP videos you made had it doing karate-like movements. If you make it do some sort of maritial arts inspired performance with corresponding audio. You could make it "break" boards, drive around attacking stuff, watch anything Bruce Lee was in, and try and copy it! A movie would also be a perfect place to get good audio tracks from.
Idea for painting draw Eve from Wall-E with a love heart around it! Pop culture sells!
Was thinking about this some more ideas:
-Picture of you with the words Daddy written underneath
-Monalisa (Probably not likely!)
-The HAL eye from 2001:space oddesy