We know exactly why Jupiter is coloured the way it is. We use mass spectrum wavelengths to detect elements. These colours are from phosphorus, sulfur, and hydrocarbons being pulled from the core mixing arbitrarily with clouds, which colours then.
Atmospheric coloring is a totally different subject than colouring a cloud. We already have custom color controls with direct and ambient light for setting colors for different gasses, but with the way decay colours work in atmosphere you can't just quickly make for instance a mars atmosphere. It's just not possible with a single atmosphere.
We'd need a simulation for direct and ambient lighting in atmospheres that can correctly model these colours based on basic gas mixes.