Bezier curves and knots script for Blender

This is a Python script that I've been working on for Blender, to generate 3D geometry based on bezier curves. My goal is to produce a variety of attractive and accurate Celtic knots and braids to use as artistic elements in my projects.

I developed a customizable picture frame as a testbench for my work. You can use it as a stand-alone project to generate a picture frame with text (or without).
http://www.thingiverse.com/thing:54020

Adding Celtic knot elements to that, my Celtic Pict