Change Windows 7 desktop icon size

I noticed someone's Windows 7 desktop had huge icons! I wondered how they did that. When I asked they said it was by accident and they didn't remember how. 

To reset your desktop icons right click on your desktop 

Click View

...and select the size of icon you want: Large, Medium or Small.

Also, you can press Ctrl and move the mouse wheel to increase/decrease the size of your icons! This must've been how the accident happened.