Let your feet do the talking...
So, first let's talk about Sugru. Basically, this amazing stuff is what happens when duct tape and poly clay have a baby! It's mostly targeted for fixing things, and it could probably fix anything.That being said, I decided to try and make something, and you're welcome to try as well; this was incredibly easy.
If you've ever seen those sandals marketed for "Brides to Be",(you know, the ones that have raised lettering on the bottom) that say "Bride" or "Mrs." on the sole, and they leave little indentations in the sand as you walk. Well, I haven't been a bride lately, lol, but it's Summer, and I wanna have a little fun too.
So, once you have your Sugru and cheapy flip flops, decide on what kind of graphic or word you'd like. Remember to make sure you get it to stick firmly, and make sure it's thick enough to be raised off the surface of the sandal by a centimeter or more so that it leaves and indentation of your design in the sand or dirt as you walk.