In one of my solo acts, I play a cheap Yamaha keyboard and sing with a vocal harmonizer. The keyboard has that one-finger automatic accompaniment. So I punch a few buttons to pick the style and tempo, then play the rhythm chords/bass with one, two or three fingers, depending on the complexity of the chord (Major is one finger, Minor or seventh is two fingers, Minor seventh is three fingers). I sometimes throw in a few simple leads between the vocals. It's pretty simple and I gig pretty steadily with this setup.
I had this idea to do an audience participation bit. I'll have a box labeled "Song Titles" with a bunch of songs that I perform written on index cards. In another box labeled "Song Styles", I'll have cards with different musical styles written on them. Volunteers from the audience will pick a song from one box and the style from another and then I'll perform the song. I might, for example, play "Johnny B. Goode" as a polka, or "Smoke on the Water" as a 1950's 6/8 ballad, or "Feelings" as a heavy metal rocker. I'm sure you get the idea.
Just not sure if this would be interesting to anybody but other musicians. Maybe not even to them. What do you all think?