A picture of yourself. My prefrence because everytime I see someone with an animated picture or something besides an actual persson (unless I know who they are/we talk) I think it's creepy, just my opinion though.
You could mess around on photo booth if you have it. You could do it of something you like. I used my cat. Just do something that describes you!
Also, you could do something with the people you love like your family or friends. (If you love you friends :p)
Whatever you do.... Do NOT make a duckface and do NOT take the picture in the bathroom. ;)
A photo by the beach! Or a place with some sort of nice scenery!
See in parenthesis, 'I know who they are' ;p
YAY!!! I'm creepy!!!