Modular Origami
Modular origami models are made from multiple pieces of paper. Each paper is folded into a 'unit'. These 'units' interlock with each other, resulting in a multi-colored, exquisite looking work of art! Each model takes two to twelve hours for assembly. What amazes me is the creativity of the designers who routinely keep designing newer and newer 'units'.

Photo Galleries: Models and Boxes.

Many diagrams are available here. The boxes below are from the book Origami Boxes by Tomoko Fuse (64 pages, 1989). After making all the boxes in the book, I developed great admiration for Tomoko Fuse — she is an exponent of this art.

Origami Boxes from Tomoko Fuse's "Origami Boxes"
Origami Boxes (upside down) from Tomoko Fuse's "Origami Boxes".
Origami Boxes (top view) from Tomoko Fuse's "Origami Boxes".
Origami Boxes (inside view) from Tomoko Fuse's "Origami Boxes".