There are a couple of decal makers on eBay; at least one of them posts in the Classic and Vintage forum. JRestore is one of them.
There are also several online decal sites where you pick your font, letters, size, etc. and they are made and sent to you. Vinyl decals. Also lots of places sell decals of animals, skulls, planes, cars, women, etc. to stick on lots of stuff.
Sunlight will fade a lot of decals, especially those printed on a home ink-jet printer.