You can change nearly any desktop icon on both Mac and PC. To change desktop icons on a Mac, open the "Get Info" menu and paste in the picture you want to use. On a PC you'll need to make a .ICO file, ...

If you decide you no longer want the Trash icon on your desktop, you can remove it by dragging the Trash folder to the actual Trash icon in the Dock. This will delete the symbolic link and remove the ...