If you are looking for 420 wallpaper free download, then you’ve come to the right place. This category contains various types of marijuana-themed wallpapers. If you’re an avid marijuana user, you’ll love this category! The 420 slang refers to April 20th, the day many marijuana-oriented celebrations take place. Marijuana-themed wallpapers are a great way to celebrate this day and express yourself creatively while looking at your screen.