I just did this on my profile and I love it. You can use the new system of showing recently tagged photos beside your profile picture to create a composite image showing your face (or whatever) across the whole top of the Profile.
It’s not too difficult, but has been made even easier by some clever person creating a Photoshop template which will export all the correct image sizes!! Guide to Create Facebook Images
Let's talk about it.
Head on over to Twitter and let's talk more.
Find me at @chrismaddern.