OOH!! I've got a round one and a square one and used to make loads of flowers. I made little ones in Christmas coloured raffa for napkin rings a few years ago. Used crochet cotton middles wound with raffia, then mounted the flowers .
Also made them in crochet cotton and crocheted them together to form mats. Used to have some patterns, will look and pm you if I find them but as my bedroom contents are in a heap in the sitting-room, waiting for my new bedroom to be done, I can't guarantee finding anything yet!! Will look though. Janet