Cool, thanks.
Right now I'm using a wallpaper I made from my first mockup of my marquee, 
stretched to my 640x480 tv screen res.  Plus a couple of Tron-themed 
startup screens and wav's.  Using Mamewah and Visual Pinball predominantly.
Good to know other options.  This was as much of an artwork question
as a technical question  (i.e. I know one guy who wouldn't put anything but
Chun Li wallpapers, side art, etc. on his cab, if he had one)