This is really not very important, but it bugs me.
It seems impossible to get a profile picture with a transparent part. Even if I upload a picture with an alpha channel, the system seems to remove it. Note the (undesired) white background:
Am I doing something wrong here (aside from being too narcissistic, perhaps)? Do you know a way of having a profile picture with an alpha channel?
EDIT: I've since found this informative question on Meta Stack Overflow: Profile picture cannot have transparent background.