Bounce, I was looking at Ace and they have concrete/deck paint by the gallon, and you can get various earth tones and a couple levels of texture FYI. About $30/gal from what I saw.
Clay, I looked at that and was curious about how it would last. good to know.
I painted the perimiter lines in that stuff, but black, and the girls want to paint the squares in pastels, so it looks like i'll need to have the paint shop mix up the colors if possible. So maybe just white outdoor concrete/deck paint is going to be the best way to go. I was still curious about whether I should try to add any grit or not.