I’ve done a bunch of different House ATC swaps. During the last one, both of my partners were Hufflepuffs! So I chose a few pages from the copy of Chamber of Secrets I had on hand (a book that was falling apart that I’m re-purposing through crafts) that had particularly Hufflepuff passages. A little watercolor and a stamp I bought on Etsy later, and I have some fun Hufflepuffy ATCs.