Is your old mailbox little more than a rusty hunk of metal sitting at the front of the house? Grab spray paint and a sponge brush to transform it into a bright and cheery letter box. Start by detaching the flag and hardware, then spray paint both the box and flag in contrasting shades. Then, use octagonal stencils and a sponge brush to add a playful geometric-inspired pattern. Now, all that's left to do is paint or apply house numbers or monograms to artfully display your address.