Sorry, I don't have a BEFORE picture.
But here's a cookie tinlid magnetbox I made a few weeks ago.
I collect the square cookie tins you get at christmas time, and use them to organize my pencil crayons. So I deccided to make use of the boards. I painted this one matte black, on both sides. Watered down some white, and splatered it around the board. Took neon elastics and stretched them. I also made Starfleet logo magnets, with clay, and double sided magnet stickers. :) It just hangs on the wall by two thumb tacks.
The cost is barely nothing, because you can get these tins almost anywhere, any shape & size. All the other supplies I was able to get at a dollar store.