[greenwallnorway]

From what I can tell in the image:

2x6: white

2x4: blue

2x2: grey

This makes interesting patterns, since you are more likely to use certain bricks in certain positions.

[FarmerPotato]

Lego retail stores have the odd habit of stocking Pick-A-Brick this way.

[abeyer]

Pick-A-Brick sounded like such a good idea on paper, until you realize that the economics of it end up being a handful of brick size/color combos and then bin after bin of minifig accessories.