Free Crochet Rug Pattern DIY Free Pattern for Crocheted Patchwork Rug from Ravelry here. If you crochet or knit I’d suggest signing up for this site - it’s free and has many unbelievable free patterns. The PDF pattern for the rug is here.
This is a great idea--to add crochet motifs to an existing bra. I would leave the original cup in, because then you would end up with a crochet bathing suit top that wouldn't stretch and fall off when you wore it into the water!