Landscaping Walls

Our Landscaping Walls are finished! Now for the fun part, to fill the tiers with bushes, trees, and flowers. Oh, how I love the Fall season! Any suggestions for types of trees to consider for these top and bottom wall tiers?

We have a ginkgo tree here in this half wall out in front of our house. We hope to have it all landscaped and finished by the end of October. :)