I originally planned to make booklets, but I would later pivot and make playing cards. Above are some of the covers I had played around with.
As you can see my queen from then was very similar to the one I had made on a playing card. For these, I image-traced playing cards and manipulated them.
I scanned in a deck of standard Bicycle playing cards, so I'd be able to sketch over and manipulate them in Procreate. I then vectorized them in Adobe Illustrator. From there, I would work on the informational sides of the cards and make final tweaks to the vectors.
After trial and error I printed them out at playing card size and rounded the corners. The printing is always the hardest part, but putting it together is fun!