My crafts for December are ornaments so little things. But we use stuff around the house too such as podgy and christmas stikers onto metal juice lids and a string on the back. Cut ornament shapes from craft foam and give them pieces of the peel and stick craft foam to put on - I save the bits from doing other stuff and then just cut them into random shapes for this kind of thing. I peel and they stick. Give them a page with three circles printed on it for them to colour and then cut out and help them fold in half and glue back to back to back to make a 3D ornament - works well with a tree or bell shape. Cut a star from gold bristolboard and use glitter glue to put gobs on it - not a fan of letting them have regular glitter because it is dangerous as they don't understand not to rub their eyes. All of these things are simple and cheap but I get tins or baskets from the dollar store to put them all in. I keep what we make here "to dry" as the kids are told and give them a picture to colour that gives them something to take home. I print up a pile of christmas pictures and let each one choose which one they want to do.