Sterling grey Se you should find many pics of black alloys as most have been done before
http://www.ebay.co.uk/itm/19-ALLOY-WHEELS-TO-FIT-BMW-1-SERIES-SET-OF-4-WHEELS/171895669761?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D33433%26meid%3D1eb69eedd5ce4b788235a026126bc1e4%26pid%3D100033%26rk%3D1%26rkt%3D4%26sd%3D171895669761
or multi spoke style i don't think seen on a forum car
http://www.ebay.co.uk/itm/19-BMW-3-Series-Coupe-99-06-Staggered-AC-SWAGGER-19-inch-Alloy-Wheels-3838BK117-/131565999313?hash=item1ea1f1d4d1
my own choice would be black backs/inners with silver spoke
http://www.ebay.co.uk/itm/19-BMW-3-SERIES-CSL-E91-DEEP-SPOKE-CONCAVE-ALLOYS-WHEELS-5X120-black-polished-/221793560825?fits=Car+Make%3ABMW&hash=item33a3ed28f9