Re: just finished a new pedal...the "Monroe Drive"....
I think you should stay with the same theme......collages of something hip.
Some ideas....Charlie's Angels (Charlie Boost), Dukes of Hazzard (Duke of Distortion), Chuck Norris/Bruce Lee A/B box. etc.
If it's not an official business, you won't have to worry about licensing. Just make them in that theme, and keep 1 and sell a few.