So, you probably don't want to be a blobby grey person anymore. It is... not very outrageous to say the least. The process for changing your picture/avatar is simple and three(ish) steps.
- On the left side of the screen, under "Navigation" click My Profile.
- Click "Edit" near the top of the content area, under your username.
- Scroll down until you see "Picture". Click the button to upload your picture! Outrageous!