I make a leather planner. I actually love it. I'm still surprised.
Materials (affiliate links):
Scrap leather (Etsy) - https://tidd.ly/3Ga4JKp
Dye - https://amzn.to/3M9vhzg
Disks - https://amzn.to/40witaF
Slightly Fancy Paper (helps hold onto the disks) - https://amzn.to/3MbGvTQ
Paper Punch - https://amzn.to/3MfSr6W