A long time ago, I made a Turtle Language in TI-BASIC. I wanted to port it to C, but ended up getting distracted with some other stuff. Namely, I ended up playing around with palette shifting and simple on-calc control of some turtrles to make some cool looking stuff:


The on-calc program has some turtles doing some things, and you can press buttons to get different designs and stuff. Here are a couple videos from my instagram:

https://www.instagram.com/reel/ChiCLHdlf6P/
https://www.instagram.com/reel/ChiMKhalb8l/

It's like a really fancy spirograph.

In terms of what's cool technically, I make use of palette shifting for some extreme color changes. Here's the (simple and probably not worth copying, but maybe worth learning from) code for palette shaunanigans:
https://github.com/merthsoft/TurtleCE/blob/release/src/palette.h

Source:
https://github.com/merthsoft/TurtleCE
Download:
https://github.com/merthsoft/TurtleCE/releases/tag/release