This birght bouquet of orange and white might be exactly what you'd want if you were feeling depressed. The large orange flowers are zinnias and the small orange ones are butterfly weed. The whites are lisianthus and a large white dahlia, and the greenery is artemesia.
This yellow and white that is also very cheery. A yellow snapdragon is surrounded by yellow lilies, white lisianthus, goldenrod (not yet open), and yellow zinnias.
Fall is definitely coming in this last bouquet of yellow and rusty oranges. The small daisies are helenium, combined with sunflowers, zinnias and dahlias. The cattail spikes are an ornamental millet called 'Purple Majesty'.