Here are my own non-23 things trading cards.
It's of my daughter getting her catching gear on before an inning. It's titled "The Silver Bullet" because that's the color of her batting helmet. For a long time, she was the only one in her league that wore a silver helmet, so she tended to stand out. Here's a trading card with her in her helmet, going out to the on-deck circle:
I can see how a person might lose a couple hours creating (and fine-tuning) a trading card.