I'd like to propose/suggest a light bulb to be the site's icon as well as for it's voting icons.
Why a light bulb?
Light bulbs are commonly related to ideas , I think that an out-of-the-box(life-hack) solution comes from an idea, something you think about and discovered it worked.
I'd like to suggest something similar(since I don't own the rights for the light bulb vector) to this:
Obviously the coloring is not what I'm proposing, it's more about the idea of a light-bulb as the icon for the site.