How to make easy homemade ornaments? ?

im having my younger cousins over xmas eve and i figured we could all make christmas ornaments for ourselves and parents and everyone. the youngest is 4 and then 8 and 12. then theres me and my other cousin. hes 15. sooooo yeah i have no clue what to make ornaments out of! it has to be easy enough for everyone. thank you soooo much.