Shop for Friday the 13th
Whether you're such a fortunate cuss that Friday the 13th is lucky or you have had a run of luck so bad that said day of doom is cheerful by comparison, Friday the 13th has the notorious date covered. It ushers in a weekend, so I personally think it must be a pretty decent day.
The Nineteenth century Gothic style of lettering gives the design a fun creepy feel. Shirts, cards, mugs, and other items include a list of Friday the 13th dates (below) to keep track of your lucky days (reminds me of concert tour t-shirts.)