Tutorial for the Sonobe Unit: http://www.youtube.com/watch?v=n1pu1sBm1pA
Origami: Minecraft Gold Sword!
Designed By: Me
(The sonobe cube was designed by Sonobe Mitsunobu) So most of the credit goes to them.
Other Minecraft Sonobe Designs:
Slime Pixel Art: http://www.youtube.com/watch?feature=player_embedded&v=NdFyZZ9z3N0
Tips: Take care of your folds at the beginning, and the rest should be fairly easy if you follow the tutorial exactly. Making careful folds, and making sure everything is properly aligned will allow you to get best results for the final product. This rule is something that should probably be kept in mind when making any origami model. Other than that, have fun!