I know this is from last year, but wanted to share a couple. Let them make a small puddle of white glue on wax paper. arrange qtips into snowflakes, I cut some in half for variety. sprinkle white glitter over and let dry. They take over a day to dry, though. The easiest way I found to dry them is to lay them on trays, then stack on top of each other in opposite directions. When they dry, peel them off the wax paper. Make sure the older ones do puddles of glue, though, or they may break (school teaches them to use little drops, preschoolers should have no trouble mking puddles. I have done this with kids 2-10, and the older kids ones just looked more like snowflakes. This is the cutest one I've done in a long time. Then maybe you could help them make gift bags out of grocery boxes? Or maybe cover them in solid colored paper and let the kids stamp, color, or put stickers on it, and they have a bag to put the snowflake in to give it to mom. Another thing you could do with all the kids is a painted christmas tree with everyones handprints, biggest on the bottom and smallest on top. cut them all out and make the tree with them, either flat or something like a coat hanger tree.
I will have to check my lesson plans to see what else you can make, I always did Christmas around the world for all of December, with one or two crafts a day