First Festive Skull Ever?

In our guild, someone asked about the current festive skulls featuring sunglasses.

Searching, I found that they originated in 2019 on 6/1 (start date for summer) and have appeared each year thereafter.

But, I was curious, what was the first holiday/festive skull redesign? Long-time guild members thought it was Easter or St. Patrick’s Day, yet I cannot locate definitive evidence either way. Thanks for any input!