I ran into this book and I can only attest to the amazing intricacies in paper art.  This goes way beyond Origami and some fancy schmancy cut and paste collage.  It features 30 prolific paper artists that will blow your mind.

Available here: PUSH Paper: 30 Artists Explore the Boundaries of Paper Art [Hardcover]

Lifesize motorcycle made entirely of cardboard by artist Chris Gilmour