Red Screen Door Trellis (The red is striking against the white wall. Wood screen doors are still pretty cheap to buy. Wood trim from a big-box hardware store could add detail to the plain screen door. Then all you need is paint!
Recycled Pallet Vertical Garden - Very little room on your urban porch or backyard? How about maximizing the space you have by growing up? I'll be using a pallet sitting in my back yard to plant garden center annuals or possibly native succulents.