Set up a snow scene for your kiddos in a corner of your classroom.  Spread some bed foam on the floor and cover it with white sheets.  Use butcher paper to create a winter scene on your wall—crumple up tissue paper and lay it along the tops of tree branches for snow.  Stuff white pillow cases with newspapers or tissue paper and tie them shut.  Cut felt snowman features to stick on the stuffed pillow cases (they’ll stick fairly well).  Add a bucket of yarn snow balls, and your kids will have a winter wonderland indoors, even if there’s no snow outside!