In reply to Blue Straggler:
A picture behind plexiglass is very nice, but you can't really change the picture afterwards. Looks fantastic though, the contrast and colours come out really nice.
I also have some framed pictures laying around in a box btw, your story sound familiar.
If you go for a frame, avoid the very cheap ones, I bought some that had a rainbow-like scattering in the glass, it looked absolutely awful. Hard to see in the shop, but (depending on the picture) quite visible with a picture mounted.