Updated all imagery to new colors

I also darkened the main editor window background color, as it was a little too bright for me to stare at for 10+ hours a day.

You're welcome to keep it where you had it, but I don't think the images will look that good with it being brighter.

Attached is a screenshot of what it currently looks like.

![Screen Shot 2013-01-04 at 7 14 39 PM](https://f.cloud.github.com/assets/122591/44625/5de5548a-56d5-11e2-9a5c-06e3eaa39c3c.png)