Have students (randomly) pick a state and make a brochure about it. This kind of assignment can be adapted for various continents and countries too. Present their brochures on a bulletin board in your room or hallway.
Kids do 20 multiplication fact test daily min.) and move on at their own pace. Tests are kept in drawers & kids grab one as they walk in, so no paper passing. Each Friday, a 100 problem test min. Liking the idea.