So here's how it works... each time you receive a blessing from God, no matter how big or small, no matter how important or trivial it may seem, you write it down and pop it into the blessing jar. Then at the end of the year you revisit the jar and the blessings it contains.
It really is that simple!
The joy of this is that there are so many blessings that you've completely forgotten about, and it is truly a joy to look back on the year and remember just how blessed you were.