Just a quick suggestion. I have no idea of your skill and experience but try listening to Mike Oldfield's Let There Be Light and Crystal Clear for a bit of inspiration. They're both spacey and moody, though you probably need to give them a minute or so to kick in. Neither are amazing tunes but you can shut your eyes you can kinda picture a few Dark Angels throwing a base together with it. As for an actual theme tune, they qualify less admirably for that, but if I can think of anything I'll let you know.
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