Below: This is Blue Denim topped with a coat of Bridal Veil ($3.95) from American Manicure. This top coat is readily available at VNS, which is where I bought mine.
My local independent beauty supply carries a wide range of Ruby Kisses, and even though I keep checking for a Blue Denim back-up, I've yet to find one. The top coat is something I saw at VNS that I thought sounded interesting, so I also picked up the gold one called Gold Dust along with Bridal Veil. The description reads: Use these shimmering top coats to gently highlight your American Manicure. Sheer Effects are translucent and reflects softly colored accents in direct light. Today is the first time I've used Bridal Veil, and it is interesting! It adds a nice subtle effect, sort of a duo chrome with only one color--a mono chrome maybe?!! It seems to add a silvery shimmer that shifts on the nail so that the edges still look like the base color.