Electronics Shadowbox
Not everyone is as lucky as I am. *I* have a power electrical engineer for a father-in-law. I know, I know not something most people are envious of, but my father-in-law has a shop full of old bits and pieces of electronics and industrial equipment salvaged from the oil refineries he builds substations for.
The picture doesn't do it justice, but this is one of my "finds" from our last visit -- some sort of massively parallel power supply/controller mounted in a shadowbox and hung next to my back door. I loved the colors -- bright green capacitors and pink wires, and the fact that it is almost symmetrical but not quite.
As projects go, this was super simple -- remove some rods and screws that were sticking out of the board, buy shadowbox, mount with 4 stickpins, and hang. Not bad for such a unique piece of art!
p.s. My father-in-law wasn't quite sure what this was used for, so if you have an idea let us know in the comments!