Customizable Lissajous Picture Frame, v1.0

With the Customizer contest as an inspiration, I took the Lissajous curves that had been sitting in my idea file for months and decided to keep the basic idea simple (a picture frame) while exploring the possibilities of a parametric design. I've used a bunch of 3d modeling tools before but working in OpenSCAD is like the VRML models I made over a decade ago. But harder.

This is my first object made in OpenSCAD and my first object uploaded to Thingiverse!

So here it is. Lissajous curves, o