> Polaroids/Disposable cameras are cheap and seem to be universally adored.

I do this on my parties! Also sometimes people ask me to bring my gear to their parties.

The guests can either keep the photo and take home some memories or gift it to the host.

My more advanced version is that I take photos with my "good" mirrorless camera, transfer the photos to my phone, and then send them to the polaroid (Instax mini) for print. Too much work as a host, but as a gift when I'm a guest I might do it :)

The polaroids is a good idea; some more expensive / corporate parties I've been at had photo booths with random silly accessories as well. I mean it's not for me because I have no whimsy but other people appreciate it.