A pinner did this. My suggestion would be to add cardboard or something up the sides to hold water. My garden did SO WELL, but it dried out easily. Also, in the individual holes, I planted herbs, green peppers and zucchini. They did excellent also!
With flowers inside OUTDOOR SHELF-bar area. ONLY 2 pallets & 3 pavers! Paint white, secure inside with simple brackets, 3 pavers-can glue down w/ mortar from hardware store or industrial glue for pavers.
Easily cud use flamesless tea candles in work or LED fairy lights fairy light jars, lighting, seasonal holiday decor, The kids think they look like fireflies so this idea could easily carry into summer as well