Right.. this is my jam. 
Snowflakes, big and small any size and shape just gold over paper a few times a snip shapes out on the fold, stick them and they are to windows and walls and hang them in groups from the ceiling.
Felt pieces cut into shapes of stockings or trees/bells/stars and stuffed with tissue paper/old cloth scraps and sewn and then hung into the tree.
Lollipop stars/trees/reindeers.
Hand and foot prints made into robins (feet) and reindeer (hands) cut out and stuck on the wall.
Shapes cut out of paper in Christmassy designs and then tissue stuck behind to make 'stained glass windows' to stick in your window.
Origami star boxes to fill with cheap sweeties or Christmas pot puri or something else (google Christmas origami for patterns)
Wrapping paper to make huge, long paper chains or littler ones hanging down.
Pop some corn and thread it onto cotton to make garlands for the tree.
If you have wool you can make pom-poms to glue or tie onto a cardboard wreath (thick card or lots of thin card stuck together to make it stiff)
Can you tell I've spent many a Christmas with children when we've been skint and trying to make the magic happen 