I'm always interested in seeing what challenges I can overcome in art. I'd do it for you if it''s reasonably small. Any screenshots of the game as it is? What kind of style are you aiming for?
If it's less than 20 tiles, reasonably simple style and you're alright with someone who has never done space related sprites before doing it I'd -maybe- give it a go (of course, no guarantees and such).
As for finding an artist; if you're looking for a paid artist, try PMing one of the contributors in the asset store. Otherwise you can look for people on the forums who would be willing to make assets for you. There is also opengameart.org which may have what you are looking for or someone who'd make it for you.