Check out the olive egger posts here at BYC or Olive Eggers on facebook for a very good OE breeding chart by Steve Neumann.I do have EE Hens... so i should try crossing them with the BCM? and get olive ee's?
The only way to guarantee olive eggs on F1 is to cross a dark brown egg laying breed (the darker the better which is why BCM are so popular) with a individual that carries TWO blue egg genes (Araucana, Ameraucana, Isbar, cream legbar). Crossing to an EE is a crapshoot. IF that EE carries two blue egg genes you'll get olive, but IF that EE has only one blue egg gene you will statistically get 50% olive layers and 50% brown layers. Go find the chart and study it to avoid a lot of time spent and resultant frustration if you don't know what genetics your EE carry.