Step 1) I bought some river rocks and glow in the desk paint from Michael's and a bit of newspaper and a paint brush at home and we were set.
Step 3) Paint the rocks (coat with acrylic spray if you are going to leave them outside.)
There were 2 very difficult parts to this craft. First, photographing this glowing rock was very problematic! Second, I learned that it takes more than one thick coat of pair to make these rocks glow. I would recommend letting your kids do a coat, then going ack and doing 2 or 3 more costs later on.
If you do this let me know how it turns out!