Here is a great idea that we use to expand on our sticker chart success (see article: Chore Sticker Charts).  We initially posted an idea to allow kids to earn stickers for doing regular chores, like get ready for school in the morning.  Our printable sticker chart has 20 spots, and kids earn a sticker for each chore completed without complaining.  They get a prize or money as a reward when their sticker chart is filled up.