Your chicks eggs will be determined by what egg colour genetics they received from their parents. There are several broad aspects to this as follows:
White eggs = No colouring factors - the egg shell is white
Brown eggs = Brown pigments laid overtop a white egg shell
Blue eggs = Blue pigment is mixed INTO the egg shell so the entire egg shell is blue
Splotches = Pigments and Bloom deposited over the outer shell in various quantities
Your chicks could potentially end up laying a whole spectrum of egg colours depending on which combination of genes they receive from their parents.
Here's some handy charts to see how the combinations can work. These are the basics - so bear in mind there are maaaaany subtle variations in between
There are several BYC members who have birds laying GREY eggs too! I believe that is a cream or very light brown egg layer that has a heavy bloom (giving a pink look to it) bred with a blue or light green egg layer.
Cool Huh!!
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