All of my first generation EEs have beards and muffs. Last summer I tried crossing a 1st gen rooster back into the mix and I got all kinds of random stuff. He's gone off to Camp Kenmore though, so I'm back to pure 1st gen EE hatches now.
Both my AM pen and my EE pen have ameraucana roosters so all of the offspring come out with buffs and beards. The splash rooster is over a couple of barred rocks (in the AM pen) and the black rooster is over an assortment of large fowl hens (buff orps, welsummers, wyandottes, wheaten marans, barred rocks, etc). I will tell you though that there was an errant gene in the AM pen last year and I had one EE come out laying brown eggs. The splash rooster is new this season though, so I'm not sure what his offspring will be like. I haven't done an EE hatch yet. That is next up on the roster. I have AMs and olive eggers in the bator right now.
The only non-standard AMs that I am doing right now are the splash.