Right click on your desktop, choose "Properties", choose the "Effects" tab in the window that comes up, sroll the little window within the "Display Properties" window until you see and icons with "Recycle Bin (full)" and "Recycle Bin (empty)" underneath them. Single click on one, then click the box marked "Default Icon", this should restore it to the original setting. Do the same for the other recycle bin icon.
Zenmervolt
EDIT: If that doesn't work, select the "Change Icon" button and pick out the old recycle bin icons from the list of thumbnails that shows up.