I love making displays! But when you work in a library with a small to medium collection, sometimes you have to work ahead of the calendar when pulling books to fit a seasonal/holiday topic like St. Patrick's Day. I try to pull books for the next holiday BEFORE the current holiday has happened. So I pulled St. Patrick's Day books the week before Valentine's Day, when they were actually still on the shelf.
Here's my sign, if you'd like to use it for your own St. Patrick's Day display. The artwork is adapted from Open Clip Art.
I'll be adding Easter and general spring books soon, as well.