Origami and Kerigami
Kids are intrigued with the ancient craft of paper folding. Kirigami is folding and cutting a piece of paper to get a snowflake (or other shape). Origami is folding a piece of paper to make a shape. These craft projects are compiled to suit a wide range of ages so pick the one that fits the kids in your age group.
Here we have a slightly more tricky ghost for kids
Kids can Make and Fly A Rotocopter, they just cut