I'm trying to find ring blanks, preferably adjustable which have rings or other ways to fasten beads and other charms on top.  I've found plenty of rings already made up, but want to make my own.

 
Welcome to our forums. You may be looking in the wrong places or searching for the wrong words. A lot of us sellers and distributors have several styles of glue on and wire on rings blanks.  Search for ring findings, beadable rings, beadable ring findings and similar phrases. Google and yahoo are ideal search engines for this.

You can see some of mine at Beadable Rings.

In addition to my own Rings & Things I know places like Artbeads, fusionbeads, FMG, Beadaholic, eebeads and beadpeddler all have some rings blanks for beading.

 Hi!  I recommend http://mcduckcreations.com/shop/  by Mary Poineal, she is pretty well known with the glassaholics :)