Years ago I started working on a yo-yo quilt, but somehow lost the hundreds of yo-yos I made in a move.

My questions to you are: what do you use to make your circles? I used a plastic top from Kool-aid, Tang, etc. and these made a decent sized yo-yo. Now that I have tons of scraps, I'm thinking of starting another yo-yo quilt.
Question #2: what did you make with your yo-yos? A quilt, a vest, a border around the binding of a quilt??? Did you use a specific pattern?
Thanks for answering and I'd love to see pictures of your projects!