Walking through the eastern sestiere (district) of Castello, I found this lovely shrine, built right into the side of a house. It was beautifully presented, with fresh flowers, lace curtains, and sturdy doors to keep it safe at night.
(18 June: I just found out that Annie [Churches in Venice blog] had done an excellent post with photos, about this very shrine. Here is the link to that part of the blog, just scroll down to Corte de Ca’ Sarasina Shrine. Thank you, Annie, for permission to use your link. )