First, to create this wallpaper I've vectored on Illustrator the cover, with different shades for every its part.

Second, I've created a blue crystal sphere by myself (at this time) on Illustratror, again.

After that I've added clean & neat bubbles and light circles brushes and for the black version a galaxy brush, too.

At least I've added Mercury Symbol and Overlaied on the blue sphere or the Ps for my Adobe Concept.

SamB.