Water proof fabric is always best if you want to cover some portions of a pallet board to create a pocket or holding space for potting purposes! This method will work great while you are targeted a whole pallet board to get a vertical garden or planter! Add the nails or use the staple gun to assemble the cloth to wood sides to avoid leakage of potting soil you are to put in later!
If you are not going with this scheme, then tear apart some portions of pallets and readjust the slats again to create holdings in pallets to gain a planter setup! If you provide bottoms to dice sections of pallets, they can serve you as better potting levels just in no time! Every picture is clear and leads to a unique idea and one can easily pullout some tricks and tips from them to go in his own way while getting a sublime planters out of pallets!
Pallet Potting Bench Planter:

Using pallets it becomes easy to install these planter anywhere in or outside of your home! You can even install them to tops of potting tables, benches to coffee table tops and also to pallet-made sofa tops for natural garnishing!
Chain Supported Pallet Hanging Planter:

Hang a cut down piece of pallet on a wall area and provide metal chain support! Add potting soil to it and gain a beautiful manifestation of hanging wall pattern!
Flat Wooden Pallet Planter:

Pallet skids can also be used to install raised flower or vegetable bed to your green space, this flat planter can really give some awesome schemes to you to gain outstanding garden decor!
Pallet Vertical Hanging Garden:

Pluck some pallet deck boards apart and reinstall them to same pallet board but as a bottoms to different dice section! This scheme will this brilliant design of pallet hanging garden that can be targeted to plant different kinds of flowers or herbs!
Pallet A-Frame 2-Tiered Planter:

Checkout this A frame remake of pallets, having different shelving levels! By adding potting soil this ingeniously made pallet structure can be changed into a accent garden planter as shown below!