Step 1: Things
chop (miter) saw
Step 2: Measure and Cut
Mark your pallet board with a pencil and cut with your appropriate tool. Cut as many boards as you like per section. 3-4 shelves is usually a good number.
Note: if you don't have a tape measure, bring your board to the stud section and mark it there.
Step 3: Install
Using a level, or you can just eye ball, shoot one Brad nail on the opposite side thru the shelf into to the stud at a diagonal.
Then shoot a few more nails thru the stud into the shelf. I used 3-4 Brads per side.
If you don't have a Brad nailer, you can probably hammer in nails, but it's going to be hard. You could also use screws and a drill.
Safety note: you will be blindly shooting nails thru a stud into a shelf. There is a chance of the nail bending thru the stud and missing the shelf. Make sure your fingers are clear.
Step 4: Load Them Up!
This my first instructable and I'm entering it in the reclaimed wood contest. Constructive criticism is always welcome! happy making