Playing Cards
We found a couple good options for all black playing cards. The first set, from Gent Supply Co., is Day of the Dead themed with illustrations done by Gustavo Borboa.
The second set is a bit more modern and features a geometric pattern on the back of each card as well as the front of the face cards. They also claim to help prevent cheating as the cards are only discernible if you're looking straight at them. There's a cool video that depicts this on the Vat19 website.