Your Introduction to the History of Origami: This diagram shows how to construct the units that make up all 3D origami projects.
3D Origami cactus with flower - Tutorial • Art Platter
3D Origami Penguin. This is a very fun 3D Origami "pattern" to make. It's not too hard although it is a bit time-consuming. See my original post here: http://ladylavendersexpressions.blogspot.com/2013/05/crafty-creations-3d-origami-penguin.html