Not an add-on for Blockland, but a separate program. Basically a program that makes maps/saves(if possible) from cubescape.
In the program, you would choose the size of the cube, 4x through 64x, the color of the cubes, plus and option for a plate on top of the cubes, and a color for the plate. You would move the cubes around and create a map made of cubescape! Faster than building it, and it saves the brick count, so you can build more stuff. When you are finished with the map, it would save it as a .zip file that works as a map.