From the information you have given, it is possible and not rare for any of your children to have blue, brown, green or hazel eyes. The probability is higher that they will have brown eyes.
Each person carries two genes that determine eye color, receiving one from each parent. One is expressed and the other is not. The dominant gene is usually the one that is expressed. Brown is more dominant than green, green is dominant over blue.
The gene received from the parent may or may not be the one that was expressed in that parent.
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What I said about dominance is the most probable outcome but eye color is not as simple as that. Blue eyes are not determined by a recessive allele at one gene. Instead, eye color is determined by variation at several different genes and the interactions between them, and this makes it possible (rarely) for two blue-eyed parents to have brown-eyed children.