This is the second volume of Facebook cover images of the animation series Code Geass: Lelouch of the Rebellion.  The TV series was first broadcasted in 2006 in Japan and ended in September 2008, where it spanned a total of 50 episodes across two seasons.  In addition, a series of manga and OVAs were released based on the original TV series.  A preview of the cover images can be seen below:
 

More information is available if you are interested in this series.
You can download the cover images here.