I started out with a piece of plywood and attached 9 license plates to it with screws. I them spray painted them turquoise. I then took scrap pieces of metal tubing (from my day job of making exhaust pipes for go karts) and welded them together to form my house numbers. (Yes, I welded them myself) I painted them green and attached them from the back.
It turned out way better than I had envisioned, always love it when that happens!
Linking to these parties: