The best way to make brown eyes to blue?
Ask Crystal Gayle.
You will have to do the research yourself, but a few years ago there was a report that stated that ALL people have blue eyes. It said it is a pigment that causes the blue to be covered and make the eyes brown, ... and there was a procedure being tested in Europe that could remove the pigment with no harm to the eye to reveal the blue color under the pigment. I have not heard anymore about this, but you may want to try doing some research about it.
Pick your parents carefully.
You can't, unless you wear coloured lenses.
Marry someone with blue eyes. Your child may.