I wanted a modular planter that was simple, yet capable to hold your plants. At first, I was considering something a little more complex and flashy, but I came to realize that complicated doesn't exactly scream quality. I settled for a simple cube, with smaller cubes and cube-like indents on the sides, to interlock the planters together. Initially, I had problems with what sort of interlockers would be capable of getting the job done, but the cubed locks should be adequately capable of keeping the modular planters together. (Some sanding may be needed to interlock comfortably and smoothly.)