Making this was quite some fun. First time for ages I've tried to do something with planets as a horizontal image and it turned out pretty fine (at least better than my other attempts, somehow it is easier for me to do vertical images x_X dunno why). Whole idea started from blue green-planet and panorama of Dresden where a stage was being assembled (now it is mostly hidden behind nots, lines, light and so on ).
I hope you will like it.
Done in PS CS3 1280x960px (download file to get it)
I used: - some of my photos for textures on the planets and bottom part of the image (it is panorama of Dresden done in June 2010. It was rainy... >.>)