slide charm flip flops

This is probably old news to everyone here, as Im usually a little behind the times when it comes to fashion. But today, I saw a woman wearing the cutest pair of flip flops. They were the ordinary black rubber style with a little thicker sole than normal. On one side there was a buckle so you could open it up and slide on different kinds of charms. Like those slide charm bracelets you see everywhere these days. The lady I saw wearing them had her name spelled out in crystal letters. I would love to find some of these. Does anyone here have a link to an online source? Or know of a retailer that carries them? Thanks.......Lynn