Great Balls of Foam make Super Colourful Ornaments!
I then made a loop out of foam as well and hot glued that on. And voila a myriad of several colours of flowerballs made from Foam! On Another note: The foam was actually very easy to work with, much easier than paper and had a higher tolerance for bending without creasing... Plus you can throw them at people and it doesn't hurt, or give paper cuts!
On the tree they are such a vivid pop of colour, I also think they would make a great mobile if done in several different sizes for a kids room.