or make it a thing only slytherin still does to show they're the wizard nazis. that would be a trivial task, as all but one of the named house elves showing up were kept by slytherins anyway. it would have been so easy not to turn this into a giant yikes.

but no, the kids are instead putting christmas ornaments on the taxidermied slave heads in No. 12 Grimauld Sq. and that's shown as a festive and cheerful thing that livens up the place before the holidays.