I made a big cardboard Cthulhu based on a 123D Creature model by Amanda Jackson to lord over the snack machines in Autodesk's Pier 9 kitchen.
Our snack machines give out $1 Sacagawea coins as change if you use bigger bills, and I thought that maybe something should guard all that gold from would-be thieves. In hindsight, it should have probably been a dragon... oh well. Maybe I'll move him to the coffee machine.
Anyway, this was a complicated model - I bumped up the scale, so it actually used the dovetail joints on some slices, even with 24"x36" cardboard. The most difficult parts were the tendrils, you really have to be organized to keep track of what goes where.
25 x 1/4" Double-wall cardboard sheets - 24" x 36"
1/2 a big bottle of Elmer's Glue
70w Epilog Laser