Thanks to everyone who commented yesterday. Sorry for the orange assault on the eyes, but I wondered if it would work as a more abstract concept rather than the usual eve scenery approach. Almost everyone agreed that stick to the basics was a better idea.
The Earth I used for the rest of yesterday was stock google image until I could get my own backgrounds uploaded. This is my current favourite but I have three more I'm interested in. Opinions as to which I should use would be welcome.