Growing herbs

I have promised myself that I will not have any plant beds in my garden - these simply do not go to urban garden ... but the temptation has grown over the years. This spring I have found a nice rusty frame from a demolishion of an old industrial building - did not know what to do with it. thought about coffee table to the deck in my garden, but instead I used some recycled wood together with water proof plywood and build a mobile herb bed ...