Yeah, all those pictures of hats look about the same to me.

I am 100% color blind and suffer from both forms. For the most part they do not look different, one picture may look a little more washed out than the other (less crisp) but they do all look the same. It is really weird because when I look at tests like this, I have no frame of reference, so it is much like not being in on the inside joker. I just don't get it.

On another note, I think traffic lights are a great example of how to deal with color blind interfaces. (I assume) The color catches the normal persons eye, while the secondary interface of position allows the color blind person the ability to know what the sign is indicating.

Shapes and position are a good way of creating indicators for the color blind.