I didn't read the whole thread here but.... has no one taken Bio 101? There aren't just two eye color genes (blue or brown); there's a spectrum of I think 7. The more you have, the darker your eyes. I.E., if you have 7, you have black (darkest brown) eyes, and if you have 0, you have pink (albino) eyes. Blue is like 1 or 2, then green, hazel, light brown, dark brown, etc.
The point is, one parent could have blue eyes (from 2 certain genes), and the other could have blue eyes (from the other two genes), and the kids could have anywhere from light blue (from getting 1 or 2) to brown (from getting all 4).
For example, my dad has hazel eyes. My mom has blue eyes. I have brown (lightish) eyes; my brother has blue eyes and the other has green.
EDIT: Oh, and also, your eye color can change from the way your iris folds up as you are growing as a lil' kiddy, so there's some more variation there.