What pattern is this?

I was given a quilt with these blocks.  Actually most of the blocks are so faded that I can't even photograph them.  These are the best ones:

I'm taking this to quilt study in June but would love to know the name of this pattern.  I've looked through Brackman's Blockbase but still haven't found anything similar.  For now I'm just referring to it as a deconstructed wedding ring.