Why some people change their wallpaper/profile picture more than others ?

Is there any psychological thing behind it. if you are a changer why do you change your picture so often ? and what do you think about people who don't change it at all ?, and if you are constant why ? and what do you think about people who change it ?

it's not that important I know, but it has been in my head for long time not. why people change their prof pic, computer/phone background so often than others ?