I don't know about your email inbox, but mine contained today several mails informing me about advent calendars. Most of those are not really interesting to me, as they're telling me to buy things at a discount every day.
There's one advent calendar I'm really looking forward to every year, though, and that is the one made by Maria and Amica from Historical Textiles. The two (self-declaimed) textile nerds show some of their favourite textiles every year, often with links to more pictures on the corresponding museum page. It's a true gem, and every year I admire them for all the time and effort they invest in that count-down.
Here's the link to their December 1 calendar blogpost. Enjoy, and I hope you will enjoy the following posts as well!