depends what colour your car is, are your alloys the rays or not?
I think that painting alloys black can make them look a little lost in the arches, but they do suit white cars well still. how about a time attach stripe around the edge for a bit of colour?
I have rays that I steadily curb more and mroe every few months and I will be getting them refurbed but in a more pearlesant gunmetal colour I think.