I saw an idea on pinterest where all members of the house put their spare change and dollars in a jar for a set amount of time. On Christmas everyone puts their name in a hat and whoever gets picked, gets the jar of money.
I thought it was a very sweet idea. Unfortunately the only other members of my house are 1 and 6 so it wouldn't work well lol. I hope I remember this in a few years so we can do it :)
Would you be interested in doing something like this in your house?