Okay,here's a brief explanation for people to learn how to credit, and have some questions answered.
How did you make that effect?
Check a tuorial, maybe, but you can also post it on
icontutorial.
How do you credit?
Well, go to Profile>>Edit Userpics.
Go to an icon, and take the icon you want to credit, and copy the code written into the comment box in the following screencap.
This is how it will look like when people see your userpics-