@FediTips

Please add #owlsInTowels. It is for showing pictures of rescued owls. They are generally wrapped in towels while being handled by the staff for the staff's safety.

@FediTips Nice list.
Probably you could add #Freitagstexterei

On friday a picture is published by the last winner, where other user can post a story about with a maximum length of 500 characters.
The poster of the picture chooses the best story and assign the honor of posting the next picture to the winner.

Maybe a shorter description:
A weekly contest with maximal 500 characters fitting to a posted picture on friday.

@FediTips An occasional one is the #WorldBollardAssociation, for vehicles coming off second-best in fights with traffic-management bollards.

(May not match your inclusion criteria, but it's one I like).