Nifty! Sadly I seem to suck at paper models as much as plastic ones. Of course that never stopped me from buying some!
Lying around are:
Wilhelmshaven's German Raider "Stier"
Sci-Kit's Voyager Space Probe http://spacecraftkits.com/index.html
Several copies of Harper & Row's "Make Your Own Working Paper Clock". I actually completed the frame of one which looks like I may have been channeling Salvador Dali at the time of aligning/gluing.
A half-built Cassini Space (Mars?) Probe (free from NASA http://www.jpl.nasa.gov/scalemodels/
A completed but then destroyed Columbia Shuttle Memorial model from Delta 7 Studios
Some of the free "7 Wonders of the World" models from Delta 7 Studios (when I couldn't even build the pyramid right, it told me something - like maybe I should stick to Lego sets).
I also had some Historic Airplanes paper kit books but the pieces were die-cut and they weren't correctly aligned so the printing on the pieces once punched out is off. I'll probably toss those. There were some very interesting subjects in there like the S.55 twin-hull flying boat.