I'm working on a couple of interchangeable button/bow ideas, but... how big is the market for that? Flip-flops aren't that expensive. Would potential customers be okay with buying a few different pairs?
I sell pivot buttons (buttons with a tack) to this company, to make these:
Here's a bigger image: http://www.legacyathletic.com/graphi.../lg_504LBF.jpg
What if you put a bow under the button before you attach it? It will be permanent, but will customers mind that? I'm trying to gauge a potential market, which currently does not exist in North Central Massachusetts.