My plain pink iphone case was starting to get boring. It's functional however, and there is no reason for me to spend money on a prettier case. So I decided to spruce mine up with spray paint and painters tape.
You can see where the paint seeped through a bit...so make sure your edges of tape are sealed tightly. But overall I'm thrilled with the new look and because I had the materials on hand the upgrade cost me $0. My fave price.