There's the Hubble, sitting comfortably on the International Space Station, which isn't as far along as I thought it was. But it sure looks more impressive with a giant telescope on top, does it not? And if I can do it in a few minutes with photoshop, then aeronautical engineers can make it happen. We've got time, I think the next servicing of it isn't until 2006. We could just hitch it with some really good space rope until someone fashions a mounting bracket for the ISS.
That one's on the house, NASA. I've got some ideas for the Moonbase already, too.