Here is a quick and simple idea for a winter collage for kids which will give the kids a real sense of achievement.
You will need:
Cotton wool balls
Large sheet of blue paper
PVA glue (white glue)
Make a lovely winter picture by gluing twigs to the paper to make a tree. Glue on some cotton wool as snow. Sprinkle some glitter over the top as a bit of frosty sparkle.