In my opinion, one of the major limitations of Thingiverse's customizer is the lack of a surface() function. Because this would be a considerable constraint on some designs I wanted to create, I made a function that takes a textual height map, and turns it into a polyhedron.

In this thing you will find two files:

• PolyhedronDemo.scad: This is a sample file that has everything all packaged up so that customizer likes it. (Note: You still might need the python file to make a heightmap.)
• imagetoopenscad.py: This Python file can create heightmaps.
• OpenScadImagePoly.zip: This above plus some sample sets.