I've been keeping a few extra kids at my house while schools out this summer, and I like to make sure that they can always grab some water whenever they are thirsty. However, I was tired of refilling tiny plastic cups every 5 minutes, so I started to use some "sport-like" water bottles. The problem then became remembering which was whose throughout the day (especially since I only have one pink one, and the 3 girls each LOVE it). I started out using packing tape with their names written on them, but that got to be a big sticky mess when washing the cups at the end of the day.
SO ... VOILA! These cute and really easy name tags were born. I started with some decorative elastic (I think it's made for kid's jewelry-making). The kids got to pick a unique button out of my stash, then we added their names with beads, and I tied it into a knot around the cups (for a little extra holding power I applied a little hot glue to all the knots).
They are stretchy so I can take them off at the end of the day while I wash/dry the dishes or while the other kids aren't here. They have been a great and frugal solution for a minor yet irritating problem!