No, only doubleshots I have are black. I did see Ascaii's GB on Deskthority, and am hoping to get a set or two. Unfortunately those are the only ones I've seen, but I guess I am fortunate in that I'm typing this on some pretty nice black doubleshots right now (albeit with a left shift key in place of the space bar as I am waiting for some epoxy to harden up in my soon to be space bar moddin' and gluin' juig.)
I'm thinking a white and black doubleshot Filco might be kind of cool in an old school kind of way...