Thinking inside the box

Every spring I plan/throw-together/struggle with what plants I will put in my garage planter box (see the photo below). Humming birds like to visit this planter. One year we found a small, grey toad hidden among the plants. When I first started gardening (about 20 some years ago) there wasn't much to choose from-mainly geraniums, marigolds and trailing verbena. There are now so many plants to choose from. I think I may need to miss some work!