They are flower looms (also known as Daisy Looms), they make little yarn motifs that can be attached to make larger items. I've never used one, but these look like really nice ones.
You can find instructions (and instructions to make your own) on
Small Looms page of Sarah Bradberry's Knitting and site. It even includes two crochet and flower loom patterns.
Thanks for posting this, I've always wanted to play with one of these and now I think I will!
Julie