I found this interesting site today. She offers some nice diagrams including one for a pocket heart. Of particular interest to me was her page about backcoating paper. She means that 2 pieces are glued together back to back. She also self publishes her books at home and gives a description about that.

Mette Pederson

This is what she says about her work.

Mette Units started out to be variations of "Sonobe" like units that can be used to create different origami modular shapes. After a while, however, the design of my units has changed enough that they are not always connected in the "Sonobe way." Many of my newer units don't even look like Sonobes. I've also started creating rings and quilts. Many of the quilts units can also be assembled into modular shapes.