Dennis,
Your request comes up from time to time.
I don't remember the modeler's website that had tons and tons of graphics that guys posted. I think it's an electric site? I'll dig.
How they make the "clear" area on decal paper disappear when applied, I have no idea? Clear coat?
My interest would be tiny lettering that isn't decals. I should, but I don't make decals.
Sparky nailed it with his really tiny lettering on his Jug. All Paint! Gotta ask him about that, I forgot who he said he got the "masks" from?
As for available graphics on line. Some are probably already at a suitable resolution that can be printed with a reasonably sharp edge. Others may not be.
I draw in vector format, so resolution isn't an issue with what I need or whoever I make stuff for. Cut masks are cut masks and cut vinyl is cut vinyl. Resolution isn't an issue unless you print on vinyl.
I do have this one website that I continue to use as an art source and also for research. I think it's great.
http://commons.wikimedia.org/wiki/RoundelCharles