I'm currently in the process of refining my Easter Egger flock into a 'breed.' Before you start breeding, make a list of desired traits. Figure out what comb type you want, what kind of temperament you want, what color/pattern or skin color. Then, when you have a clear idea of what your 'ideal' would be, figure out which combination of breeds have at least two or more of those traits and start cross breeding. You will need to line breed to strengthen and establish each trait. Don't try to work on establishing more than two or three traits at a time. Trying to get everything you want in just a few generations isn't going to work out very well.
For example, I love my Easter Egger rooster's coloring. I want pea combs, deep red coloring with the columbian pattern, muffs, beards, yellow skin, dark legs, and green eggs. I'll be calling them Columbian Reds, both because of the pattern/color and because of where I'm located geographically.
The color seems to be the most difficult trait to breed consistently at this point. It will take a few more line breedings to get that straightened out.