Step 1: Decide how many crates you need for the height of your bed. Try placing them in different directions on each other to see what works best. I used three crates for my project. See if you want pieces taken out of the crates, all you need is the other end of a hammer to prop off different pieces. I used one crate upside down, and two more on top. I used a hammer to prop off one side on the other two crates.
Step 2: I painted all my crates white (of course use whatever color you like). Before you attach all the crates together, paint them and let them dry.
Step 3: Attach the crates together. I used four brackets, and 8 screws. See bellow: