Alright, so read this thread first:
It is an old thread, but I felt that I had to link to that as some of the things in my material are not my own (the look up table that RyanB provided) and there’s just generally relevant info there.
Okay, so in regards to this material: It is super hacky and not all of it works as intended (the polar caps only show in the preview and the procedural starfield is something that should not work even as it does) but I’ve received a stupid amount of PMs asking how I made my horrid planets and I figure that it’s time to just let everyone have it. I have not worked on the material since I posted the results in that thread, so no, they aren’t better than the pictures you see here. If you do use this as a base, I’d love to see you take the material further and hopefully share your material with everyone else as I’m doing now. Well, that’s it for now. I hope you get some use out of this.
Edit: There’s no .uasset file (I’ve already gotten a PM about this) because of the issues that arise when people try to manually put in .uasset files and I don’t have time to help if there are errors. So I rearranged all the screenshots and added in a detailed instruction file to alleviate any issues that you may have in manually piecing the material together.