You can use other materials to make it if you want!
Step 1: You will need
and some foam (pompoms may work as well)
Step 3: Step 2
then put the foam inside!
Step 10: Step 9
then use the spin in place program to make your sphero keepon spin.
or program yourself to make your sphero keepon to do even more cool tricks...
(sphero keepon cannot actually listen to music, it just looks like a my keepon)