I found this delightful fabric on the back of a cotton crazy quilt. The top was probably pieced in the 1950s, but I think this backing was applied a little later. The color palette says 1970s to me.
It's really silly and happy, isn't it?
The cluster of mushrooms measures 1 1/2" tall.
The quilt was very, very damaged. The backing and batting were mostly torn and gaping in many places, and lots of the top had barely a single piece of intact fabric. I did manage to salvage and mend a few corner areas for keepsakes. And I found enough fabric intact on the back to take a couple of photos for my (and I hope your) enjoyment!