There are lots of excellent SC themed wallpapers out there and even a dedicated thread on the RSI Forum (https://forums.robertsspaceindustries.com/discussion/31067/wallpapers-central#latest).
Post any that grab your attention in this thread.
Really like this one.
http://i.imgur.com/BPhI7u5.jpg - 1920 x 1200
(http://i.imgur.com/BPhI7u5.jpg)
Wow
Sent from my Nexus 5