This project was a Pinterest success and one that entertained the girls longer than 5 minutes! I pinned a couple variations of this sidewalk chalk here. This is the recipe I thought worked perfectly (and was easiest to make):
We used old paint brushes and painted on the driveway and also filled a few spray bottles and sprayed the chalk. Both worked great. The mixture dried quickly into a colorful, chalky texture. It came off the driveway easily with water.. bonus!
Of course, they had to try painting their arms and legs too….