Put the bars and levers where you like them most - don't pay attention to anyone's opinion unless they're fitting you.
I reckon black tape looks best because it makes the levers look part of the bars, but there's a type of tape that just has colour on the drops, fading to black. That's the best way to put some colour on the bars, IMO. Can't remember what the tape's called but I think someone posted it somewhere here in the last few days.