TL;DR
Make the default palette more vibrant, so is more pleasant to play/stream/view the gameplayWhat ?
The default palette of factorio is very dull. Yeah, it's match with the plot of the game (you crash in a planet and has to make your way out) and the theme (factories are grey due pollution), but the colours can be more vibrant, and so, more pleasant to the eye.I don't want to make factorio a 'cartoonish' game, only a bit more 'vibrant' to the eye.
In this example below, i slightly touch the gamma curve of RGB channels individually. This can be implemented in a graphics shader or in the set-up of the allegro display. The default factorio palette is at up-left and the 'vibrant' one is at down-right. Between the two thick red lines, the difference can be viewed.