If you have two pallets and a free day, you could have two Pallet Herb Planter Boxes! You can also put them on wheels. I made two of these simple planter boxes on wheels for my fiance.
How to build Pallet Herb Planter Boxes:
It took a day and about two pallets. I assembled them with simple butt-joints and then sanded the rough edges down. I didn't need them perfect. I wanted a rustic look. You can also line these with food-safe liners to prevent water leaking out.