It took me a while to think up this concept when I was wondering what to do to try out dynamic painting. There are so many things you can do with it. I have made a footprint with it before and created a trail for snow, but I wanted to try something animated. This is a simple dynamic paint it uses the wave feature and I used a sphere to paint on a plane and that makes the ripples. Next time I will do something more elaborate, but this did get the result I was going for.
Software: Blender 2.79