This is a 3D representation of a multiplication table: The higher the value, the higher the cube.
Back to school with OpenSCAD / Customizer!

I just had time for a short test print, and the numbers are good readable.

TODO:
-Print a full 10x10 copy!

Update: 2013-08-22
Added a few more Options to customize even more!
Update: 2013-09-03
Fixed a minor glitch in the script that lead to unprintable STL files.

Print it out, highlight the numbers with something like a sharpie or a similar product (nail polish should also work).