Thought I'd share some upgrades and hoping to see what others have done. 2014 X6 (E71) 35i with subtle mods:
-Installed aluminum sport running boards (2 hours labor, easy DIY)
-Black overlays on roundels (they actually hold up very well)
-Black center caps (not overlays, found on eBay)
-Smoked sidemarker (also on eBay, perfect fit, easy DIY)
-Painted key hole cover (at Bimmian, 5-minute DIY)
-Painted hubs & calipers (went with unassuming black Hammerite)
-Painted front reflectors (PlastiDipped after overlays didn't look good)
And for the timeless problem of sticky door handle pulls, I found a UK vendor on eBay that custom-makes velcro-fastened leather covers. Look for JB Customs. They are AWESOME. Bought for two Bimmers already.