Well, sort of.

Doc Watson's "Brown's Ferry Blues" has both brown and blue in the title, but doesn't revolve around the colors. Additionally, it has some funny little quips about life.

"The Green Door," while not really a folk song, is about a green door.

Maxwell's Silver Hammer (also not a folk song, really) is a song sung happily by the Beatles about a triple homicide. With a hammer.

Panama Red is perhaps the best song I've offered yet. A country-rock song by NRPS.

Summertime Blues is another song like Brown's Ferry Blues. But it's rockabilly.

White Lightning, by George Jones, can be funny in some parts.

That's it.