I always transport my MacBook in a Tucano notebook case but I am still looking for more creative and colorful ways to dress it up. What I've found is this great See Thru Hard Shell for MacBook, which is essentially a two piece snap-on protective hard shell that's compatible with 15" MacBook Pro Core Duo and Core 2 Duo computers. (There are additional sizes on the website as well.)
I like the idea of the case because it allows protection and access to all features at the same time. I hate to admit it, but I have ruined a computer with a spill in my bag and my current computer is only a few months old and covered in scratches. The See Thru Hard Shell for MacBook is $49.95.