How are Stack Overflow's default profile pictures generated?
48672
How is the default user avatar generated?
107585
Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requiring the user to "Allow" the application)
125255
How to ensure that all new users have the same profile settings as the current user?
29980
What's the point of the \Users\Default profile?
31619
How to modify the system default background image
32818
New users and attaching images
10446
Facebook: Ways to preserve image quality of uploaded images?
61544
No background options other than default pictures
25579
Any way to specify the location of profile data
66035
Facebook-derived profile images are not displayed in Firefox when tracking protection is enabled
122363
As a moderator, how do I handle a potentially inappropriate profile picture?
70300
Moderating user avatar
71409
How are "Little Planet" photos created?
157934
App image uploader replaces previously-uploaded image Markdown with most recently-uploaded image URL
107893
How to view the full size and remove old Google Profile pictures
72724
Thumbnail image on Stack Overflow
154683
Photos for OS X: How to generate album automatically at import