I make a habit of snatching the pallets when we order servers rather than letting them be thrown in the trash. Colleagues at work have taken note of this and started setting them aside for me, so I now have more than I could ever use. This is fine, my wife and I sometimes like rustic looking things which also seem to be in style right now. What doesn't get turned into projects makes great wood for the firepit in the back yard.
This weekend I made a shoe rack for the bottom of our closet.
Here's a picture of the original problem, unsorted shoes.
After pulling nails and other metal out of the pallets, I cut them to shape on the table saw. Then glued and used my pneumatic brad nailer to stick them together like this.
I didn't use any finish on them. Just left as raw wood. The bottom of the closet is a stable and dry environment, the plain wood will literally last for centuries like this.
I screwed the runners to the inside of the closet wall and then just set the shelves on them. This way, if needed, we can just lift the shelves out without having to undo any screws.
Here's a picture of the finished project.