I am using Happ Illuminated Round Pushbuttons on my cab. 1 Player, 2 Player, Esc, Pause, Insert Coin. These buttons come apart and allow the insert of a label / artwork, etc. I printed my "stuff" on vellum cut it out(using the plastic diffuser disc in the button) and put 'em back together and bingo a lighted button with a protected label / art.
FWIW, I can take a picture of one tonight after class and post it if you'd like *shrug* (c) 2003 Rampy