I created the pattern for this laser cut music box in Processing.  The lid contains an inlaid Hilbert curve, a kind of space-filling fractal shape.  You'll find the Processing sketch, as well as the PDF it produced on Thingiverse, where I uploaded the project.

This is one of 4 such boxes I made as Christmas presents for my family.  The colorful Js on each side represent each of four family members (our names all begin with J).