Buy a mirror. Put letter stickers on it. Paint over the whole thing. Peel off stickers. (use canvas instead of mirror. Paint canvas what color you want your letters to be first, then letter stickers, paint over, peel off)
You can purchase this Gold Mirrored Glass Tile small space, mirrored subway tiles, accent wall. This is beautiful! or Silver Mirrored Glass Subway Tile small space, mirrored subway tiles, accent wall. This is beautiful!
Designers often use oversized mirrors in small spaces to help reflect light and make the spaces feel larger than they actually are. A twist on this idea is to choose architectural-style mirrors which create the illusion of an extra window or door.