I made this Pallet Wood Garden Planter for my wife. The only thing that I had to purchase were various sizes of galvanized construction screws and potting soil for the box.
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First, I turned the heavy-duty pallets on their sides, measured and cut two 2x4"s to the horizontal side measurement. Then one 2x4" was screwed onto the sides of each pallet down from the top about 12-15". This horizontal board creates a lip for the 8' pallet top to be secured together. Each board end of the pallet was secured with screws and formed the bed of the garden box. Next, I used the single 8' boards and tacked them on as side boards. The raised garden box is now pretty much complete. I lined the box with heavy black plastic to hold the dirt in and secured with a staple gun. Finally, I poked some holes in the plastic bottom for water drainage and added soil and manure. Now the raised garden is ready for planting.