In 2012 I took it upon myself to create a new Facebook timeline cover every month. I tried to have every design have something to do with certain features or events that take place in each month.
Initially the avatar picture was an afterthought, but eventually I incorporated an element of seamlessness between avatar and cover photo when it made sense. Fairly recently Facebook underwent another redesign that put names and buttons in the timeline area itself in addition to raising the avatar section higher, slowly encroaching on the artwork. Oh well.