Make them a mermaid tale or any other sort of costume piece of a character they like. I am sorry I don’t have a how-to on these as I just sort of made it up but I will give you one tip that may help if you decide to make them. I used a wire coat hanger in the fin part to give it some body. I folded down the top hook part of the hanger so it wouldn’t hurt my kids feet, too. Shhh…. it is our little secret! My kids have been having a blast with these.