All you need is a scroll saw (I used my dad's new Craftman Scroll Saw to do this and it was so much faster than my off brand scroll saw) and a block of wood.
If this is your first time using a scroll saw then you might like to read step 2, if not then just skip it unless you might want some helpful tips on cutting. I like to sand all of my cubes and stain them so if you dont want to do this just disregard
Important: I will shortly post a picture of my sanded and stained cube.
Step 1: Selecting your Cube
The largest size my scroll size will cut is a 2in. cube. Its best to start with a plank of wood thats the size of your cube. Make sure you dont get too big for your scroll saw or you could seriously mess it up, the very action that the saw that uses to cut makes it get smaller than you think.