You can really pimp out your profile page by adding a cover image to the header area. This is a full size background image that will make your page really pop.
Visit your Profile Settings
Make sure Profile is selected in the sidebar (default).
Select Upload Cover Image.
Crop your image.
Cover images need to work nicely for mobile devices all the way through to large desktop monitors. This is why we set an aspect ratio that works best for all sizes.
Make sure your image is a good size. We recommend a minimum width of 1200px wide and optimised for web. 300dpi PSD files are not good in this world.