I have NO idea whatsoever. Extremely cool - has the ancona look with the eyeliner and all but then for some reason reminds me of the coloring a really old cayuga has. What color are the parents? Do you know what colors they have in their back ground?? That is just so neat!
I believe we did decide that CYOOOOOT was officially a duck color a while back. (Cute is also an acceptable spelling for that color in the BYC Duck Standards Book
He came from a Fawn and white hen, and A Gray and white drake. The drake looked like a fawn and white runner only it was gray instead of fawn. I do not know what colors were behind them. I found the color fascinating! I would have used him last year but all my Female Runners disappeared. I am planning to put him on a white hen this spring and see if I can get some more like him. This is from Holdereads site http://holderreadfarm.com/photogallery/runner_ducks_page/runner_ducks.htm The bottom picture reminds me of him as a duckling.
He is a cutie! Are you sure of the parentage though? There are a couple of ways you could have gotten that color and pattern, but not from the colors you mentioned. One of the parents may have been a Pencilled or Blue Pencilled (which could look almost Fawn and White), but not "true" Fawn and White because F&W carries double blue dilution. None of the offspring from a F&W should end up Black and White. On the other parent, I could see it possibly being Blue Magpie or Blue Bibbed, like a Swedish. I am not sure what you mean when you say "Grey". If you really mean what is called Blue in ducks and the other parent was Pencilled or Blue Pencilled, then 1 in 4 could end up Black like your bird. "Grey" though is technically Mallard coloring. The other color that probably looks the closest to an actual Grey-color is Blue, which again would make sense based on your description and the appearance of your bird.
If you want more of the same, I would definitely not breed to White. I would be more inclined to breed to Black (if you want to breed back to a Runner). If you don't have a Black, you could also get where you want to go by breeding back to a Blue, Pencilled, or Fawn and White. It would just be a longer route, but I could tell you how to do it. Breeding to white won't get you there though. If you are more concerned about the color, not keeping the Runner type, you could breed back to Black Magpie or Black Swedish (or Blues). There are a number of different options. It just depends on whether you are going for color or type and whether or not you won't to keep the Black. As I said, it also depends on what the parent birds really were.