Okay, so like I said you can do black x splash to get 100% blues or you can get rid of your blacks and do blue x splash which will give you 50% blue and 50% splash. I personally like the look of the splash as the colors contrast/complement each other better. Make sure when you are deciding who to get rid of you also look at the quality of the lacing as well as the overall look of the bird. If they are just for backyard pets you don't have to be too picky, but if you want to work toward show quality or at least "better than decent" then I recommend you see if there is a thread, or a facebook group, dedicated to them, and check out the SOP on the Wyandotte website.