This build was inspired by the Lego House DOTS competition where they wanted 6x6 plates decorated with white, yellow and purple DOTS. I made a couple of patterns and realized I could write code to create them in any shape or size i wanted.

Shown here are the designs for 3x3 but the worm filling pattern could be for any rectangle size. Squares were chosen so the pattern could be tiled by rotation. The code for you to generate your own patterns is on GitHub