Here's a toy I have been playing around with. Perhaps somebody can use these functions for fancy shaded 3D rendering or something like that.
I have a few functions that draw "RGB" pixels to the screen using pattern dither that are approximated using the rgb values of the pico8 palette.
If you move the cursor around with the arrow keys you can see the triangles. The vertices can be grabbed with the "z" key and the color of the vertices can be changed with the "x" key.
Originally I had been thinking about making a gradient image compression algorithm, but it seemed less interesting after getting half-way through.
Here's a spinning R G B triangle for fun.