Something I've picked up as of late, a hobby to enjoy in a more physical, hold-it-in-your-hands way. :)
Postcrossing is an activity/website, in which you participate by requesting people to send postcards to – and you, in turn, being assigned to others to the same end. It's about exchanging postcards, about learning about the recipient and putting together an original message, about sprucing cards up with postal stamps or whatever stationary-friendly stuff you have lying around, if you're inclined to either.
My current "routine" consists of:
-buying a variety of postcards when I get the chance, usually from stationery stores or tourist-y destinations
-if buying from a place that has rubber tourist stamps, stamping each with one (as a special Czech Republic bonus ;))
-getting stickers and sticker sheets from cons, alongside merch orders, and so on (this isn't necessarily a Postcrossing thing, I just like stickers and (key) charms :D)
-requesting an adress when the writing day comes, learning about the recipient, picking a fitting card from the collection, writing a personal message...
-...and if the usual bottom right space isn't already taken up by a rubber stamp or a pre-printed image, and it fits, maybe adding one my stickers :)
-sending! And occasionally checking the post office for incoming cards, since I have them delivered poste restante...