Memorial/Holy Well/Shrine

Since I'm been working on memorials I started thinking about shrines and making my own. I like the idea of starting one in a public space and getting other people to contribute to it. it would be a way of engaging with the community.
These are some photos of the Holy Well of St Bridget that we saw in Ireland. Looking at these is kind of a starting point for how i might make my own.


Things to think about...
Location-where would seem like a fitting place for a memorial/shrine? It would need to be seen but maybe not extremely obvious, maybe something to discover.
Materials-traditional shrine materials, things that would denote who/what the shrine was for. non-valuable.
Topic-for cancer victims, yeah?
What else...?