Tire Stickers.... or stencils... Not for everyone, but I do enjoy designing and cutting the stencils. Its always a good challenge to try and get the stencil just perfect for the tire. Usually takes a few good trys but with some patients and time it usually works out.
The process is pretty simple if you have some basic knowledge of adobe programs and an x-acto knife. Below is a quick video of the process on my old RSX.