When I'm bored I make origami among other things, I learned about these little hexahedrons t not to long a go. They'r fun to play with and quite easy to make.
Step 1: Paper
Take three pices of origami paper and fold them in half and then in half again. Then fold the coners up to the center line created by the first fold. It hellps if you have a basic knowledge origami folds as I am not an expert at explaining things.