As long as it isn't something toxic that cats can ingest, I think it's pretty harmless. I used to have a solid black Turkish Angora that I always wanted to paint like this one:
but with white instead of purple. Perhaps, I watched too many episodes of Pepe Le Pew. I like this one also
Some of them just look ridiculous.
I'd still consider striping my kitty if I ever desired it enough to try it, but my cat now has such a gorgeous coat, I can't imagine anything making it look more beautiful. It's hard to believe I adopted her as an adult stray.