Hey PImaster!
Nice wall! When i creat space walls i use a program called....Universe Creator.
It`s a really fantastic program to make stars,nebulas,planets...well you name it.
The save file is only in BMP but you can convert it so some other format later.
A lot of presets that can be changed easily! U wont it?
Just say the word and i`ll send it to you!

Here is an old wall i made 3 years ago. It doesen`t have any planets or nebula couse that was my first space wall attemt. But it`s only an idea of how it can look like. Example yuo can change the star spikes/color/ and much moore in houndred ways.

Click on the image

I don`t speak English,i speak Swedish.If you don`t understand my English you can ask me.