painting half the wall

I am in the process of choosing a colour for my master bedroom. Naturally it is going to be a white, but I am feeling this trend of painting half way up the wall in a different white. Talk about going crazy! Haha. But I love this trend and think it works great with some stronger colours and contrasts too. It's a super easy way to add interest to what may be an otherwise boring wall. Check it out in these great examples.

black and white chair rail
hallway17
2012-10-3-insp3
rough-two-tone-wall-remod-2
9bf67bc4a78f9d8ef0546ad0d02a855d
579b30545624865fe852d28cab04c0b3