Instead of just giving carts the ability to replace colors in the palette with other colors outright, I propose a totally dumb alternative:
A new screen rendering mode which does linear blending on the image by shrinking the 128x128 screen area to 64x64, turning this:
Games would have to be designed as 64x64 to make proper use of this of course (unlike my test case there...)
The basic idea is: To make a new color, all you need to do is color each pixel in a 2x2 area with different colors you want to blend together to make the new one. Then when the screen gets scaled down, all those pixels will get combined, making a huge number of new shades and hues available without just letting you change Pico-8's base palette colors outright.
Now excuse me while I study how composite video cables work so I can figure out CGA Composite Mode rendering to make 16 colors out of 4...
Have you seen this?
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