Facebook has a new feature on their Timeline format. Cover photos!
Choose the category, click on a thumbnail to reveal the full size, right click and save as.
To add a cover image to your timeline:
Go to your timeline
Hover over the existing timeline photo or Click Add a Cover
Choose whether you want to upload a new photo or pick a photo from one of your existing photo albums
Once you choose a photo, you can reposition it by clicking on the image and dragging it up or down