Ok, so I dusted off my google-fu and went looking around for you! I went looking for flowering annuals, suitable for containers, hardy in Zones 11 &12.

I had a lot of fun "shopping" for a different zone!!
Unless someone from a zone more similar to yours comes along with a reason why these are not suitable, I'd start here!! (I admit, I'm not really sure of my suggestions.)
I tried to be open minded about it, but in the end, I stayed true to my nature. I hope you like pinks, purples, and blues.
Brazilian Fireworks (Porphyrocoma pohliana) - purple-pink spikes of tubular flower clusters, the leaves also have attractive silver veins. The plant is well suited for growing in containers. It likes shade, so might do well indoors. Blooms in summer.
Calibrachoa (Calibrachoa hybrid) - blooms resemble miniature petunias in shades of red, orange, pink, purple, white, apricot, yellow, and blue. Blooms in summer, likes full sun.
Heliotrope, Cherry Pie (Heliotropium arborescens) - velvety blooms and lush, glossy foliage, its fragrance makes it a butterfly and gardener magnet! It can be grown as a houseplant, likes full sun. Purple flowers.
Kalanchoe - popular indoors and out for their ease of care, low water requirements and attractive, succulent leaves. Locating them in a warm, brightly lit location will assure the added bonus of dainty blooms in shades of red, orange, pink, white, and yellow. Also good as a houseplant.
Others to check:
Lantana
Livingstone Daisy
African Daisy
Blue Sage (Salvia farinacea.)
Hope that helps!
