Zx-spectrum multigigascreen mode. That mode has 2 bitplanes with 15 color palette in each 8x2 cell. Resulting palette contains 102 colors.

 

This experimental work.

Multigigascreen mode has four colors on a cell 8x2 pixels. But I decided to make a pixel size of 8x2, in which case I can use any of the 102 color palette, but the resolution is obtained with very little. One way or another, but the result looks quite interesting.