I'm not sure if you'll agree with me, but sometimes, the most ordinary blah objects are the ones that bring back those happy vacation memories. Just like a scene from a Harry Potter movie, touching a shoe or rock magically sucks you into a different world, and Tada! it's like you're on vacation again.
Here are some ordinary, everyday things I've picked up from vacations past: pebbles, sea shells, a feather and a little bit of sand (packed into an old film canister). These can be displayed in small bottles or glass dishes, but here's what I do with them: