This may be obvious to some, though I think it may still need some explaining to those who are new to Windows 8. If you find that the desktop icon is missing in Windows 8 you can restore it simply by repinning it.
If you’ve accidentally unpinned your Desktop icon/shortcut from the Start Screen in Windows 8 you can restore it by doing the following:
Hit the Windows key or hover in the bottom left of your screen
Once you get to the new Start screen, swipe up from the bottom, down from the top, or right-click anywhere to get the App Bar and click “All Apps”
Right click the Desktop shortcut (under “D” )
Then choose “Pin to Start”
You will now see the Desktop shortcut back on your Start menu and you can drag it anywhere to your liking.