A simple, free and surprisingly beautiful solution is to use smooth beach stones and permanent marker. It was a wonderful excuse to take a late evening walk on the beach this week. We had an awesome thunder shower that day, with a lot of lightening and flash flooding, but by the time I got to the beach the sky had cleared into a swirling mass of bright blue and white with a rainbow. It was incredibly peaceful. Give me that over sizzling on hot sand under a high sun any day.
Here are some of my stones:
Wherever you are, I hope you're near a nice beach so you can make your own.