Your X is tough because the black (matte or gloss) kind of gets lost with all of the black plastic of your undercarriage. Body matching them blue may be too much for you and with your shadowline window trim, chrome is out. So my vote is for something like...

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the REAL Shaka Zulu
My X5 Page: http://www.xoutpost.com/userpage/RealShakaZulu.html

Silver w/ Black Interior
'03 4.4i w/ Sport & Winter Pkg
ClearBra, BimmerSpinners, XM Radio, Pirelli Scorpions, Thule Rack (Snowboard), ADS Amp, MB Quart (front), Focal (rear), JL Subwoofer, GG Bailey Custom Mats, Dension Ice>Link, ACS Pedals