If you’re planning to hang a bunch of picture frames on a wall, Marissa Waddell of Roost suggests laying them out on the ground to figure out frame placement. Once you’re happy with how the frames look, simply take a large sheet of wax paper and outline the frames. The paper can then be used as a guide for where to hammer in nails on the wall, giving you the exact layout you came up with.

Another Take on the Gallery Wall (via Lifehacker)