You suggested--I listened! And miraculously, I found some opaque deep yellow beads at the little variety store a few miles from my home. I wasn't too optimistic that I would be able to find the right color or size of bead, so I feel pretty lucky. They even had matte black beads that will be perfect for eyes, etc. in the future.
I'm very slowly getting the rounds attached to my mystery quilt. (That out-most border isn't sewn yet). It takes a while to decide on color placement and to match all those seams. Lots more borders to come!