We don't get many colorful fall leaves here at the house, but with a little gardening know-how we have fall flowers that are lovely. The first 2 photos are the wild purple asters that take no care at all. Next are a few photos of different marigolds.
Morning Glories are one of my favorite flowers as they are so easy to grow and vine nicely over things that don't look so good. Once started they re-seed yearly by theirselves with just a bit of water here. Where it rains more you usually don't need to water them. In fact to much water and they don't bloom, just making the nice vine.