Eyes color changing?

jaye
 
My husband and I both have really dark brown eyes, when our son was born he had the most beautiful blue eyes, which i do know that some babies are born with blue eyes and most change over the next few months or days but his never did he is almost 2 1/2 now and  his eyes will change from blue grey to grey to green. I don't want his eyes to change to to brown! lol  Does anyone else have a child that eyes changed as they got older ?