I messed around a bit making some planet Gfx and a scripted star scape. It uses parallax movement tied into your character's movement. Also I rummaged around on the internet and found some free use animated asteroid gfx, and tweaked them to add in some shading.
Also, I designed the planet's graphics in layers so you can have the planet's shadow rotated appropriately away from the system center, most likely a large star.Animated planetary rotation could be possible, but cropping a circular image could be tricky.
It's over on testbed. If you wanna check it out, swoop over and send me a tell. I do not know how to make chat commands for adding my weapons to players, sorry.
A link to an imgur album with a few more:
http://imgur.com/a/5kXUb