I saw this over at jmb’s blog and had to give it a go:

Your Brain is Yellow

Of all the brain types, yours is the most intellectual. You crave mental stimulation, and your thoughts tend to very complex. Your thoughts tend to be innovative and cutting edge, though many people don’t understand them.You tend to spend a lot of time thinking about science, architecture, and communication.

What Color Is Your Brain?

I think they may have me there, definately a thinker.