It only recently occurred to me that I should probably make a topic about these rather than leave them buried in the thread they were in; signature advertising or no. So I present a selection of papercraft Energon cubes I made a year ago. Just print them out, fold them up, glue them and bam, as many cubes as you want. You can use normal paper if you wish but if you want them a little stronger, pick up some card stock paper. Here are a couple shots of them in action. Though I should point out that the stack of them have tape between the layers so I could more easily move it around. Without the tape they sit flush.