I had meant to do that a long time ago, but I wasn't sure exactly what I needed to do. Now that I look back on it, it's simple: copy the boilerplate text from the top of any GPL source file to the top of all your files, then make sure you include the COPYING file from the same tarball in your tarball. Duh! I have no idea now why I thought that was so confusing.
So, here's my tarball. I think I'll call this version 0.000000001.
It's pretty much abandonware for me at this point; I've moved on to other things. Do with it what you will -- just be sure to share like good girls and boys.