You can
buy samples of car vinyl wraps on Amazon or Ebay and those are usually big enough to cover most
mods, but you'll have to make your own template. That is the material most vinyl wraps are made from. 3m also has a site selling them. The color range is limited and no graphics.
There's a few smaller companies making wraps but the largest one is Jwraps who also have a lot of unique selections for almost every pv that's ever been made. They are the leader, good customer service, discounts once in a while and offer a custom wrap allowing you to use a picture. Some don't even look like a wrap once they are on. They are constantly adding new designs.
Some have posted having good luck with printing on window cling vinyl. The ink is not very permament so it's good to have a clear wrap to put over it.