Here's a photo of my yo-yo quilt. I tied the yo-yos to a sheet.
http://www.quiltingboard.com/picture...ilt-t1959.html
Just wanted to add, this is not something you will sleep under! It makes a very heavy quilt and is somewhat delicate.
I decorated a t-shirt one year. I stitched the yo-yos on in the shape of a tree. That shirt sagged so bad. Those little yo-yos were just too heavy. Perhaps if I'd made them smaller!