We've all got rusty nuts
Some people get them chrome plated or you could go for these;
http://cgi.ebay.co.uk/20x-ALLOY-WHEEL-NUT-BOLT-COVERS-IN-CHROME-17mm_W0QQitemZ310061751880QQcmdZViewItem?hash=item 310061751880&_trkparms=72%3A12|39%3A1|65%3A12&_trk sid=p3286.c0.m14