You can now personalize your profile page a little more now by uploading a custom header image! Just log in and browse to your profile by clicking on your name in the upper right of the screen, then click the "Manage Account" button. On the manage account page just click the "Edit" button in the header image section, then you can upload and crop your image with our cropping tool, then save your changes by clicking the Update button.
Keep an eye out for more site upgrades in the near future! :)