Then I would travel on down to the local Big Box Store and stock up on whatever catches your fancy. I would suggest Petunias, decorative sweet potatoes and Million Belles. To stand up and give your basket height, something like Coleus.
Pack them together. Annuals don't need space - they will be dead by the time the first snow falls. In a 10 inch basket, you could probably squash in at least 8 - 10 plants. If you get them in 6-packs, 10 or 12. The operative word here is 'Squash', as in wall to wall.
Post a photo when your basket is done. I LOVE annual baskets.