Ok, I made a slightly altered version of the Desertplanet. Nothing dramatic, just a slight adjustement of atmosphere and clouds.

And a totally new planet. It isn't as good as it could be, so I might tweak it later.

Finally, my first attempt at making a gas giant. Looks good, but I think it still needs something. Suggestions?

@TinCan
Heh, glad you like them but I wouldn't suggest trying them out just yet. I can give you the full tga versions once I'm happy with them.
@ChronoReverse
I don't see any aliasing, but then again I'm half blind

Maybe it has something to do with the jpg compression?
@Arculis
I'm pretty happy with the atmospeheres as they are, so I won't be changing them too much (unless the public opinion is totally against it

)
And yes, rendering the nebula is worth it. I'm not good at PS, and I know you can't make anything like that in just a few seconds. And the good thing is that you can make infinite amount of variations of it in LW.