Ask your partner to create a scrapbook of memories that the two of you have shared. These days, digital prints can be made up cheaply. You can ask your partner to write up memories or poems, include mementos and souvenirs or whatever else you may have kept... get them out of that shoebox and into a book!
TIPS FOR CONSIDERATION
Anything worthwhile doing is usually a difficult task. Scrap-booking takes time and effort. Make sure your partner seems like the 'scrap-booking' type before you ask.