This was on the list, so I finally got around to creating realistic cloud layers on the planets. What I did was take actual NASA cloud maps of Earth and then wrote an algorithm to thin or thicken the clouds based on a randomized planet’s particular atmosphere. Below are some example screenshots. Some polish remains to be done, of course.
Thin clouds, not like Earth at all.
Thicker, closer to Earth-like
About the same as Earth:
While I was in there, I rewrote most of the planet rotation/drawing code to make it a bit more efficient.