Using a Silhouette Machine (or http://10ws.co/1jdVfkn) you could make tons of designs + it would be useful for tons of other projects. Failing that just get good with a decent craft knife
Tons more ideas on http://10ws.co/1KBuFHC
The metal hoop I used is a Darice Brass Metal Ring (12″) (similar to http://10ws.co/1KBvn7Z)
The paper piercer (http://10ws.co/1jdVUlI)
Full info and pictures courtesy of http://allinonedaystime.blogspot.co.uk/2011/01/butterfly-mobile-tutorial.html