amazing graduation present for your kids (or nieces/nephews)! Every year write them a letter until they're 18, and put a small amount of money in it, then when they graduate - give them all the letters + money!
31 quarters in the jar at the beginning of the month, every day that they do not do their chores, they lose a quarter. Whatever is left at the end of the month they exchange for cash and the quarter jar is refilled. Not to do "allowance" for chores, but rather teach chores/responsibilities as how they contribute to family. Interesting perspective.