Now that I think of it... it would be nice to actually -build- artificial planets and such. Say 4-6k worth of plating and cabling and a planet generator or something an suddenly you have a new planet. Or moon.
O'Neill style colonies might be neat as well, especially for games where you can't colonize certain planet types and/or atmospheres.
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"What do -you- want?" "I'd like to live -just- long enough to be there when they cut off your head and stick it on a pike as a warning to the next ten generations that some favors come with too high a price. I would look up into your lifeless eyes and wave like this..." *waggle* "...can you and your associates arrange that for me, Mr. Morden?"