It seems like the paper “rings” are impossibly intersecting, but actually it’s made from 6 pieces by Thoki Yenn.
This Froebel star by Froebel Friedrich is made from 4 strips of paper.
A shuriken like modular star by Robert Neale.
The Yin-yang paper box is made with 2 circular pieces.
An action model made from 8 Tung Ken Lam’s jitterbug modules.
An origami car that looks like the VW bug, by Charles Esseltine.
An action model by Jeremy Shafer.
The twin crane is a bit more complicated than a simple one…
A modular origami which lets you make a cube, an octahedron, an icosahedron and so on, by Stephan T. Lavavej.
Hexaflexagon action model, by Paul Jackson