I'm not really the right person to answer since I haven't done a smashbook, but my oldest granddaughter loves doing them. I think of it as a scrapbook album without all the work :>)
She just went on a trip to DC and NYC and took a book with her. Each day she'd "smash" in the ticket stubs, receipts, notes of what they did...anything she wants to keep, but not worrying about adding flowers, glimmer mist, etc. If she adds a button, it's one she got on the trip. She's leaving room to add some pictures for each day, but just to show what all she did.
If you go to the Gallery and click on the search tab (not the search bar at the top) and put in "smashbook" you'll see lots of examples.~Judy