First filled a balloon with water, leave it in the fridge for 9 hours, remove it from the fridge, break and remove the balloon, crack open the week side of the ice, pour out the water, and insert glow sticks (you can buy them in any “Bazar”) or if you don’t want to buy any glow sticks, place any special plastic “treasure” of your own.
Go into a dark room, and admire the awesome glowing orb you made.
Then, you can do another experiment with your ice orb. Put it in a bowl, pour salt over it, and add food colouring. The rivers of colour created by the melting ice are going to be super-cool.