Used img2scad - http://github.com/l0b0/img2scad - on the Thingiverse favicon with misc. parameters.

Installation / upgrade: sudo easy_install -U img2scad

Syntax: img2scad [-b|--base=N] [-l|--log] < input_file

For each pixel in the input, it will create a cube in the output. The height of the cube corresponds to the whiteness of the corresponding pixel.

If -b or --base is specified, all values will be shifted by that value. This can be positive or negative. This can be used to output zero values.

If -l or --log is specified, the logarithm of the grey values will be used for the output.