On my old Blog I have written an extended article about how to color your gameboy camera pictures to a more eyefriendly state. The colorpalettes in this article were picked by hand to be "nice". Last week I found a link for creating these palettes easily with only three sliders and a preview picure at http://4bytes.art/crc.html
If I would be etter in programming, I'd implement this in stacksmashings gameboycamera downloading server to change the downloaded picture instantly. But I am not. sadly.
Hope the link helps anyone,