Got TF:Prime Voyager Ultra Magnus. Love the robot mold, great design on the alt mode, but lacking in paint apps. Problem: Solved.
Took just a little bit of time to add in some much-needed paint to certain areas. Did the mirrors, wheel rims, exhaust stacks, rear panel stripe above wheels, taillights, trim around the taillights, and a little dot of red on the front grill badge. Not a majorly drastic change, but enough to make him much less 'plain' from all sides.
I'm pretty happy with the results, so I thought I'd share.
Before (image from tformers.com):