Start the year with an empty jar and fill it with notes about good things that happen. Then, on New Years Eve, empty it and see what awesome stuff happened that year. Good way to keep things in perspective.
Throughout the year, write down memories.... ‘firsts’, a funny comment by one of your children, accomplishments, etc. Add thru out the year: ticket stubs from movies, concerts, or sporting events, snapshots, small souvenirs from travels, any trinket or token attached to something you want to remember. You might need a BIG jar! Open at the end of the year and reflect on the blessings of that year.