Ever wondered how to change that nondescript blue icon that's to the left of your user name to something more, erm, individualistic? Worry not, the solution is simple - it just requires a bit of prodding around some menus you might have not visited before. But before you know it, you will have changed your profile pic to the one you've always wanted. Here's the four-page instruction manual, right here in the slideshow.
By the way, the instructions should apply to all Lollipop-based third-party Android skins, assuming manufacturer X hasn't decided to get rid of the user profile system, in which case, you're s... talled.
How to change your user profile pic in Android Lollipop