I think the color scheme is definitely a must-keep, as well as the general form of our CF logo. It would be a good idea, however, to polish the logo; you know, make the image sharper.
[Get your insults out, I will hear quite a bit for this]
I was also hoping we could make some changes to the reputation system. As of now, I feel like it's backwards. One of the most important reputation is the one that the new users give you after you help them with a problem. Equally important is the reputation that a established member gives you for helping them with a real life problem, or maybe they think you've been doing a good job helping others. The reputation that's useless are the ones for a funny remark, or the ones that are given when you have a strong opinion that another person happens to agree with. I don't know exactly how the reputation system works (if you can disable it on certain forums or if you can set the amount of rep a person gives to you so its the same for everyone), but some changes to make it reflect the ability of a member to help others would make it much more valuable.