Little bitty pretty things
general journal junk
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idealog
If there are small items you'd like to keep that wouldn't work in a two-dimensional thing like a journal, consider making a trinket shelf out of an old tea box or other box/shelf that's got a lot of small sections in it. You can save and display all sorts of small things this way.
Consider using museum gel to keep things in place so they don't fall out.
This would work for small figurines, toys, jewellery, keychains, buttons, and anything too bulky for a book.