Is there a way you can tell what color egg they may lay?
Not before they start laying.
Easter Eggers are mixes. Most will lay bluish-greenish eggs but not all. Some lay pink or brown. Part of the fun of EE is that you never quite know what they'll look like or what hue their eggs will be. I have my first EE now who is dark brown and white-she looks like a little hawk. She should be laying here in another month or two. I'm anxiously awaiting that first egg from her to give my egg basket a splash of color (hopefully)!
Are you planning to keep her?