Hey everyone!
Now with "Feeds" available and everyone connecting and interacting with others, it would be a really good timing to be able to personalize your account page. When other users notice your posts/comments or even votes, they can quickly glance at your account but might still not to get to know much of you unless they scroll all the way down and try to see if you've made an introduction post.
But with a personal background on your page, you could upload a background for the header and give the other users a first impression about your account or yourself. This would help give accounts a more unique look and users would connect easier with others who share the same interests.
Here is an example I ms:painted together quickly:
Let me know what you think about this feature being implemented, feel free to comment here.