Block off a bulletin board in a calendar format with yarn or ribbon. I have done this bulletin board for 5 years now, and the children look forward to each new month. This board is used as a homework motivator.
Students make their game piece on the first day.
I laminate them and add a velcro piece to the back. Students move on the board according to how many homeworks they pass in. I have had little difficulty with getting homework turned in since I used this system. The week before the 100th day of school, pass out a large gallon size ziploc bag to each student. Tell them to fill the bag with 100 of any item they choose.