I have grown flowers for selling at Farmers' Market, last year I didn't go to market as much as I planned and just used them for the house. I grow celosia (cockscomb), cosmos, rudbeckia, globe amaranth, elephant head, zinnia's, bachelor's button, queen anne's lace, bell's of ireland, calendula, snapdragon, statice, sweet william, yarrow, sunflowers (cutting kind), butterfly weed, love in a mist. I've grown lots of different flowers, I'm sure I didn't get them all.
The ones I just seed directly into the garden are bell's of Ireland (they like to be planted in May), elephant head, zinnia, cosmos, bachelor's button, sunflowers, and love in a mist. The rest I put in winter sowing containers and I'm going to try to start them on Dec. 21st this time. Flowers seem to take longer to grow, at least for me. Go to http://wintersown.org/
for more info (Trudi is also on FB if you want to "Like" the group). It's super easy to grow things this way. I even got mint to germinate this way. They like the cold stratification I guess.