I have lots of old negatives! (FYI: I have not made this! I saw it pinned and liked the idea. I don't know if it works. You may not think it's a good idea. Don't do it if you don't! :)
For less than $10 you can make a one-of-a-kind lamp that commemorates your personal history or other past events. Creative lighting aside, this quick project also finally finds a use for those old 35mm negatives you have lying around.