Help:VBulletin:Profile Page Customization
How do I customize my profile page?
You may be able to edit the design and styling of your public profile page (if this is enabled by the board administrator) via the 'Customize Profile' section within the User CP. You can adjust the color scheme, fonts, borders and layout of elements on the page.
You can also use images as background for various sections of you profile. First you will need to upload the background images to an album you have created. Background images can be sourced only from albums defined as public, or 'profile' type. Images in private albums cannot be used.