Happy St. Patrick's Day / Lá Fhéile Pádraig Sona Daoibh
This is my own take on a hand-drawn Leprechaun's Hat with a black band and golden buckle. It includes the Gaelic phrase for "Happy St. Patrick's Day" under the hat, and there is light shading all around the hat to make an overall circular shape to the design.
This obviously is more of a U.S.-centric St. Patrick's Day motif than a traditional Irish one. After all, the color associated with St. Patrick is blue, not green. And, leprechauns traditionally wear cocked-hats (like a tricorne) or possibly derbies. However, here in the U.S. our wee folk seem to dress in green and prefer this style of hat. :-)