Let the kids play indoors with mittens on. Add ice cubes to build mini igloos. Build mini snowmen. Add small farm equipment and trucks for imaginitive play.
Popsicle sticks make great pretend trees.
Two twins would be good. When dry, do the other side as well. When that side is dry, cut each into a large snowflake pattern and hang from the ceiling. Silver glitter can be sprinkled on while the paint is still wet for a sparkly look. Let the kids sprinkle that fake snow stuff onto the glue.