Cannas have lush foliage, but can be top heavy. Try underplanting cannas with low-growing pots to cover up those bare ankles. The plants in the containers are:
Lime foliage - Ipomea (potato vine)
http://www.provenwinners.com/plants/ipomoea/margarita-sweet-potato-vine-ipomoea-batatas
Purple foliage - Setcreasea
http://www.plantoftheweek.org/week276.shtml
Orange flowers trailing - Calibrachoa (Million bells)
http://www.provenwinners.com/plants/calibrachoa/superbells-dreamsicle-calibrachoa-hybrid
Purple flowers trailing - Calibrachoa
Around the cannas I plant Dahlias (peach coloured ones), Salvia 'Black and Blue', Coleus 'Sedona'.
The large leaved tropicals in the containers are Canna lilies. The green one is Canna 'Bengal Tiger'.
Here's a link for info
http://www.plantdelights.com/Canna-Bengal-Tiger-Bengal-Tiger-Variegated-Canna-Lily/productinfo/819/#.UJiW6Y6DiME
The red coloured one is Canna 'Tropicanna'. Here's a link for more info on that variety
http://www.onlineplantguide.com/Plant-Details/424/
Here's a couple of Houzz ideabooks that give you info and ideas
Ideabook: Great Design Plant: Canna 'Pretoria'
Ideabook: Great Design Plant: Cannas
I hope this helps!
Glenna
(PS. I put three plants - 1 gallon size- in each of these containers and fertilized weekly with 15-30-15)