This piece is an old heating grate — I found a couple of these at the flea market. At the time I had no idea what I was going to do with them, but I knew I'd be able to use them someday. The detail is really lovely, and there is a little hook at the bottom that I used to hang an old key.An all-mirror gallery wall would be beautiful in a living room or entryway. Or how about all-white finishes for a more uniform look? The great thing about this project is that there are no rules!More: A Gallery Wall for Every Personality