It took me all bloody day and a poorly written pattern I found on Ravelry, but I did my first bit of 3D entrelac knitting!
PS. I made another cube a day later and found it to be more successful, especially sticking with one color. The joins came out better. Keeping the yarn the same gauge, I used a #3 bamboo needles instead of the #7 that I used on the first one, and I didn't stuff it so full, so it looks more like a cube than a ball and has a tighter stitch.