Check this site out.
Bobbin Toppers
I'm doing a VH II bumble bee build and am using one of Wolfe's Marshallhead pickups, but needed to make it white like the one in the real bumble bee. So I bought two of the bobbin toppers from the link above and - voila - now the humbucker is white.
I'm probably gonna throw a Seymour Duncan 59 in one of my other VH guitars, but want to cover up the white "Seymour Duncan" script on the lower bobbin, so I'll buy a black bobbin topper for a whopping $2.