Two of my favorites are Morning Glories & Nastursiums.
Both have very hard seed casings, so an overnight soak in warm water and then you can plant directly outdoors after the danger of frost has passed.
I have some huge urns around my hot tub on my patio with tall Bamboos planted in them.
I plant Nastursiums around the bases every year, they cascade out and are so beautiful, edible too, and…they are a great source of shade for the Bamboo roots which like to be shaded and cool.
The morning glories can be grown in pots along a deck railing, trellis, or planted along any sort of suppport for climbing. Both are awesomely beautiful and extremely easy to grow!