Now that spring is here (despite the freezing temps we expect overnight tonight ), I'd like to brighten up my balcony with some colorful flowers. What kind of flowers/plants are good for a south-facing balcony that gets lots of sun? I need something that's easy to take care of and really hard to kill, because the only thing I know about gardening is that I'm not good at it.

Thanks!

p.s climate is mid-atlantic US - hot and humid in the summertime.