It is so important to document your year abroad: take photos, write a blog or a journal, make a photobook, draw or even film what you get up to - you definitely won't regret it.
But one thing you will do naturally, almost without noticing, is collect bits and pieces; from postcards and tickets to maps and ideas on a napkin.
Rather than sorting through all of your memorabilia after your year abroad, why not create a keepsake as you go?