I've never grown a Fall garden in Texas, but if I did, I would probably pick a bright red heart-shaped cherry tomato like Gardener's Sweetheart or something visually interesting but sweet like Isis Candy Cherry. I'd also want something bright orange, like Jaune Flamme, because it practically glows in late summer and fall sunlight (well, it does that here in the Northeast). I'd probably also grow a pink tomato, but it would be hard to choose just one! And what about cucumbers? Here, I grow cukes on tomato cages stuck into mounds -- kinda similar to containers, I would think. And a container full of giant red mustard or chard would be beautiful.
Now I'm wishing I had two seasons for gardening...