
If you like nature photos there are a bunch such as #Mosstodon#LichenSubscribe and #ThickTrunkThursday.
There are also more than a few communal activities on here (some are synchronous, some asynchronous) which is a great way to meet people: #Monsterdon (sunday night "monster" B-movie watch party) #QueerRomanceClub (queer book club, reads one book a month), #BikeNite (people ask bike questions everything from the basics to super technical stuff and are very friendly to encouraging new riders), (there is also a video game club that does a game a month, but I can't recall the hashtag)