You'd be surprised how easily it would be to spiff this up and make it look grimey, varying in color, but not using complex techniques... Some watered down craft paint (black's and browns) after you tape off some body panels and change some grey shades with rattle can spraypaints and you're on your way to something pretty special.
Making it look pretty's really secondary though to my point... All Star Wars ships come basically not pretty now. They haven't done a good paintjob in eons on a vehicle.
I'm just saying, don't even paint it though if you aren't comfortable trying that... Just use it as a backdrop to your pilot action figures so for once the figures don't look like they could just step into the cockpit or pull themselves up into it from the side.
Their Rebel Fighters almost all always looked comically small next to figures, even when they increased the ship's size.
The guy's paintjob just highlights the diamond in the rough.
Modelers are already eying up the Falcon too... I read recently that they think it may be a perfect match for some of the Fine Molds kits, just needing a little detail work and paint, and it's there as a nice companion bit.