I used a rattle can to paint the lugs on my 3Rensho Allez. Not a contrasting color, but some previous owner had sanded the original paint off of them.
This picture was before I cleaned all the residue from the masking off. You can see that I left some ridges. I think you could effectively hide that with lug lining.
BTW, I also had a Grand Record powder coated. I had the lugs powder coated in a contrasting color (as well as the seat tube panels). I've heard that people only agree to mask Nervex lugs if they've never done it before.