I am actually afraid as the undo key is not available here and much of my efforts may go in vain if I try one of these. The X-factors should play the perfect role to make it come attractive. The fact is that you can find much unattractive ones in the net. So selecting the best is simple but rather time consuming, though only a few create such ones. So here are a few selection of mine.
1. Yulia Brodskaya at Artyulia
2. Carlo Giovani and at Flickr
3. Andrea Russo Papercraft at Flickr
4. Jen Stark
5. Boveylee
6. Zim and Zou
7. Charles Clary of Paper Extravaganza
These artworks would not be of any use unless they find their right place. The ones featured above have been covered enough. So do forward your artworks and popularize them.