You can roll them, play catch with them, or even play fetch with your dog with them.(Larger dogs may choke, my dog is really small and cannot choke on it)
NEWER VERSION: (https://www.instructables.com/id/LED-Ping-Pong-Ball-Improved/)
Step 1: Gather Materials
Super bright LEDs
Two Ping Pong Balls
CR2032 3V Coin Batteries
ONLY SUPER BRIGHT LEDS WORK!!!!!
Step 2: Gather Tools
Hot Glue Gun
Step 3: Put Together LEDs
Put Together LED Throwies. It's the same concept as putting together a throwie, except you need no magnet.
Heres the instructable for throwies: LED Throwies
Step 4: Cut Ping Pong Balls
Get one ping pong ball and cut hole in top so that you can fit LED Throwie inside.
Then put throwie inside.
Step 5: Glue It Up
Put hot glue in ball so it keeps throwie in place.
You do not have to fill all the ways just fill so that LED does not move around inside.
Step 6: Cut Other Ping Pong Ball
Cut the other ping pong ball in half.
Step 7: Glue Side to Hole
Glue one half of the ping pong ball to top of led ball.
Step 8: Your Finished!!!
Mine did not come out that great because I ran out of super bright LEDs after I was fooling around with my green one. My first was better due to the super brights.