This is an awesome prank to do at your work place or school. your prankee wil be clicking for hours.
Step 1: Copy their desk top picture
all you have to do is press the prt scr/syssqr button (the print screen button)
Step 2: Cut all their icons
First select an icon and then right click and click on cut and paste it into the recycle bin. do this to all the icons
Step 3: New backround
now paste the image from step number one and your done it should look like the picture below