Somehow I changed the size of the icons at my desktop.
How can I restore them to their original size?
This is how they look now:
You can change them back in the Finder menu. Click anywhere on your desktop and type Command+J this should bring the menu up. In versions earlier than Snow Leopard I believe the default size is 48x48. I think SL may be 64x64
the GUI way
Or go into the system prefs. and click on the blue guy in a blue circle," the disability icon", this lets you change the icon size in you're blind and also lets you enable a screen flash/