Heather Bailey has an awesome yo-yo tutorial here.
There is so many things you can make with them ...
I made some simple brooches by adding a pin back to the backside of a yo-yo.

These will be avaliable soon at MyMy!
I also turned a yo-yo into a posy on these little pouches.



Made with denim, corduroy, and cotton lining with felt "leaves".
Now lets see what you come up with.
Happy yo-yo making! :)