Sign up here to paint the rock for your child's birthday. Please sign up on the day you want to display the rock. The rock will be available to you for painting beginning at 4 pm the day before you signed up. If your child's birthday lands on the same day as someone else's, please choose a day near that or work to split the rock with the other family. It is free to paint the rock. Bring your own paint and supplies. Spray paint, acrylic paint, craft paint, and good old wall paint work well on the rock.