I've been tossing around the idea of powder coating the lugs a different color. I currently have a granite gray with black rims, I was thinking about going with a dark burnt orange color on the lugs. I borrowed another forum members pic and did a quick photochop of orange for the lugs and calipers.
The orange looks fairly seasonal, as in harvest time, Halloween....
Not overly noticeable, does set them off a bit.
... Maybe a blue white for winter, green for springtime, gold for summer?
A guy on the Corvette forum has his lugnuts the same color as his car with black wheels and it looks really sharp, I'm sure there's a few colors that don't work well but it's unique.