Introduction: How to Use Pasta for Glue
Not much to it, just mash up some cooked pasta in water or cook it til it falls apart and the liquid is pretty thick.
Then smear it on there and pretend it's glue. It works great.
http://en.wikipedia.org/wiki/Wheat_pasting gives more tasty details.
The story behind the picture:
To drive from Boston to Florida without falling asleep and dying, I checked out five gallons of books-on-tape from the Cambridge Public Library to listen to on the way. When I got there alive and finished the tapes, I put them in this box to mail them back. My sister didn't have any glue to put the address label on, but my brother-in-law had just cooked up a mean batch of pasta. I mashed up a couple of noodles to use as glue, and sure enough, it worked like a charm.