I just love my window boxes! Our garage is a side entry and our windows face the street. This is the window box on the left side. Ignore the refections of our gardening tools that were out that day!
Window box on the right. In the front there is a Japanese Maple Tree, Holly bushes, and many, many, perennials. The Vinca that you can see hanging from the box reseeds in my garden every spring. I just cut off several pieces and stick them in the dirt!