"Donor House: The Beginning of the House"
"Afterlife: Friends with Death"
"Magi: Energy Healing"
I like all of them, approximately in that order. I really like these settings, too. Each of them takes a fairly familiar idea and turns it on a different perspective.
The author has a bunch of other settings as well. I recommend that you visit and browse around. There are more stories from other people's prompts. The main prompt page has a donation button, although a key goal for August was to generate enough fiction to give people a good sample of these settings. I would enjoy seeing more, so I hope this project does well.