Short answer... most likely your rooster does not have the gene for blue eggs. There is a slim chance he does, but no way to be 100% sure until you breed him. UNLESS, he was bred from a breed where the gene for blue shells has been isolated from the pea comb gene, like a cream legbar.
The gene for blue eggs colors the shell. Shells are either white or blue. Your EE rooster probably doesn't have the gene for blue shells but your hens probably do. Offspring from them will get one blue gene from mom, so the shells will be paler blue than if they had genes from both parents. If mom herself only has one blue gene, there is a chance some offspring will have white shells.
Here's the catch, there are other genes that control egg color. While the shells are either white or blue, other pigments can be added to the outside of the shell during egg production. The amount of tan or brown pigment depends on the hen (some don't have any at all), and when the tan/brown gets applied over a white shell, you can get anything from pale cream to chocolate brown eggs. If she has a blue shell, the brownish overcoat makes green, olive, grey, kahki... So the best blue egg layers have 2 genes for blue shells and no or very little pigment added to the outside.
If you want guaranteed blue eggs, find a breeder of true Ameraucanas or Cream Legbars and buy hatching eggs or chicks. I myself, love hatchery EEs. Mine have been healthy and hearty and lay a generous amount of eggs... but no guarantee the eggs will be blue. My 8 yr old EE hen still lays eggs 3x a week, but they are green. Kind of a dull grayish green at that, but I wouldn't trade her.
Oh, and if you buy hatchery EE pullets, there is a good chance you will get another cockerel! They seem to be harder to sex than other breeds.
). I suggest checking out the market for chicks in your area. Lot of people want straight run prices with a return policy on cockerels. 
