I’m also in the rocks camp. I also bring home pine cones and pieces of wood. Last time I had some passengers riding in my back seat I had to move all of the rocks and pine cones off of the floor so they could put their feet down. The most recent rocks came from Palm Springs. I chose them because they had mica embedded in them.
If someone was bringing something home from their own trip, for me, I would like a food item from the area where they traveled. My Mom brought home pecan pralines from New Orleans one time. They were sooooooo good!
I guess I should have mentioned photos too. I’m a person who can easily take 300 pictures in a day, so I come home with lots of photos.