To prevent unfinished work from being lost, have them stick in their front folder. When they have finished something else, recess, or at the end of the day, they can look in their front folder for unfinished work.
Snowball Fight...kids write 3 things about themselves on a sheet of white paper. They do not write their names on the paper. Wad it up and on your command, have a "snowball" (or baseball) fight. At the end of 1 minute, each student grabs the nearest snowball and tries to guess who wrote it. Would be great at the beginning of the year!
pickles and ketchups—On Fridays, place them on the board. Anyone who has turned in all of their assignments is a “pickle” so write their name under the pickle sign. Anyone who is missing an assignment has their name placed under the ketchup bottle. Pickles can “pick” a fun game or activity, while “ketchups” catch up on missing work. It is amazing how quickly assignments come in!