This first one really made me smile. I call it the minimalist shrine. No flowers or decorations, just a stone cross with a money box on top. Many of the shrines of Venice have donation boxes with locks, and I've often wondered who goes around collecting money from them or even has a key that works (some of the locks look quite antique).
This particular box had a coin stuck in the slot. I tried to push it in but it was stuck tight. Perhaps the box was made for lira (or ducats!) and someone tried to put a Euro in?
This one is on the island of Murano so it's fitting that there's a glass vase on the table next to the Madonna and child.
A very ornate shrine inside sotoportego Corte Zorzi in Castello, with gold reliefs of grapes and ears of corn on the sides and an image of San Antonio inside. This tabernacle was made using materials recovered from restoration work on the pulpit of the nearby church of San Martino.
This one is on the side of the church of Sant' Antonio in Castello and has a nice mosaic Madonna and Child inside.