Pegasus, the complete book of origami. Personally, I do not like this model one bit. It looks unappealing, and the shape turned out wrong no matter how i adjusted it. it was also a pain in the neck to fold the base, as the diagrams were wrong, and did not show the steps clearly, or provide any reference points.
The cube, the complete book of origami. It's just a cube, but locking it up from the inside was again, a pain in the neck, and it never really locked up correctly.