AK Designs has a fantastic template pack out, Timeline Pack 2. It will help you get creative on your facebook timeline cover. You can purchase it at Scrap N' Pieces or Scrapping Fairytales.
I also used Sugar Moon Designs wonderful kit, Swimmingly and the add-on to create my new Summer Fun Timeline Cover. You can purchase these at Divine Digital or My Memories.
Here is my new timeline cover:
font: Janda Apple Cobbler