Well, turns out that making planets in Photoshop isn't actually that hard and the results are way better than everything LunarCell can produce. What you can see here is one of the background textures I want to replace. Hope you like it
Found a neat little Photoshop plugin to create planet images. Here's a first test of what Onderon could look like instead of the blurry mass it is in vanilla. Looks pretty good for only 10 minutes of work I'd say