This might fall into the frivolous category for a lot of people, but I make a lot of home screen icons for shortcuts I use frequently, so I enjoy the MacStories Shortcuts Icons tremendously.
I’ll even admit to going a little nutty and replacing several of my app icons on my iPhone home screen with them, using them as app launchers rather than icons for shortcuts, but that’s another story. I wouldn’t recommend that for most people, as it makes opening an app into a bounce-through-shortcuts experience.
Still, it’s fun to experiment with alternate looks that Apple won’t give us.
But if you create lots of shortcuts and put icon shortcuts to your actual shortcuts (whew!) on your home screen, these will help give personality to them as well as make them easily and quickly identifiable for you.