As one rock-n-roller to another, I like your concept. Incidentally, my screen name on this board comes from the name I gave to a franken-strat I recently built.

I like the amp theme, but for what it's worth, if I were using such an idea, I think I'd experiment with the amp photography a bit before settling on something so basic. The first thing that popped into my mind was a close-up photo that kind of looks "along" the front of the amp, including controls, etc., such that part of the amp is in the foreground and extends off into the background (bonus points for a sticky, circular beer bottle print being visible on the top of the amp). I don't know how handy you are with a camera (or what kind of camera you have) but if it were me I'd try using a depth of field trick that puts soft focus on the really close and far, and sharp focus on the Marshall logo (or whatever point of interest you like). I'd do it like this:
- set the camera to Aperture Priority (usually denoted by "Av" or something similar on the mode dial--at least on Canon cameras)
- manually set the aperture to its largest opening (which is the smallest numerical value)
- mount the camera on a tri-pod or something steady (holding it won't work)
- set some nice ambient light (perhaps by a window in daytime) and turn off the flash (light from most camera flashes can be harsh and ugly)
- set a trigger delay so pressing the shutter button doesn't cause blurring
- press the shutter button halfway down to set your exposure by focusing on the logo (or whatever point of interest you like) and take the shot
The result should have your logo in focus with a softening effect in the immediate foreground and extending off into the background.
I'd take a picture of my own amp to demonstrate, but unfortunately it's stored over at the jam space.

Ok, I'll stop rambling now.