I really like the light text on dark back ground.
I love the gray and green. Im doing the same thing with a site.
Take this as a grain of salt, but i dont think that blue works. I'll post the color code its at now in case you change it. i printscreened, pasted to gimp... #4f559a is the blue.
Im sorta hard to please color wise. it's been hard to deal with myself
Oh and your light green button looks too bright, especially with white text. the green is #9bd188
I've only seen the home page so far. I love the idea of polls. Good Luck with it.