I re-did my mailbox planting this year. You can't see everything, but I was going for a red, yellow, and orange look. So far, I have the following planted:
Hesperaloe parviflora Red & Yellow
Echinacea 'Cheyenne Spirit'
Echinacea Double Scoop 'Raspberry'
Gaillardia 'Moxie'
Gaillardia - Yellow
Kniphofia 'Papaya Popsicle'
Lemon Drop Primrose Oenothera
Agastache Summer Series (Summer Love, Summer Sky, etc.)
This hasn't filled in yet, but it should look good when my Agastache and Gaillardia get more full. The Hesperaloe has been there 4 years and the blooms last so long! I like the red and yellow together. I ditched everything but the Hesperaloe. Those are some awesome plants if you want red and yellow together! It's obvious that I don't like a formal look either. LOL.