I didn't go round but I did paint angry "brows" on the top of the lights to make it look a bit more childish, er sorry, make it look more "aggressive". Yeah, that's the ticket!
I wouldn't do round because you'd wind up with two 4" circles. With a nose full of rectangles on the v1.0 Xterras the round lights would look out of place.
As far as light output goes, try re-aiming them a bit. That made a big difference on mine.
Ever meet someone that accidentally bought a set of 35s?
They call me Birddog. Master of the Sawzall.
35x12.50x15 BFG A/T on Legos
De-Plastified and Blacked out