Pay someone to do it, unless you know what your doing it won't look as good as you want it too or volunteer to work around a paint shop to learn the craft.
I once videotaped a guy getting a blow job on 23 in the middle of the day with the OPs flip he looked over and not a single fuck was given he evaen gave us a thumbs up
Came in expecting this
http://i89.photobucket.com/albums/k204/stangsn95gt/black.gif
http://ragefac.es/faces/e1f11b7e02abf942f13564a72220ff34.png
Looked like fun