I've written cute Halloween messages and images on them now. This time I used a chalk pen, which gives fantastic, clean, crisp results (see sources below). I filled a large mason jar with the rocks to decorate my tabletop.
I little natural twine around the top of the jar adds the finishing touch. My kids will have fun drawing and writing on these rocks as well.
I had a hard time finding a white chalk pen at local craft stores, so I've listed to great sources for them below.