I think these are an American tradition, but they have become a favourite in our house as I've got a rabid dislike of tinsel!
Not much instruction needed on how to make these. Pop some corn, and use a needle and thread to join them together (I use a double thickness of thread.)
Patience is definitely required as the corn is liable to break in two, but the evidence can be easily destroyed by eating any failed attempts. A nice idea is to string dried cranberries between the popped corn like little rubies.
My photo doesn't exactly do these justice. I'm planning to string them up among some holly and ivy, rather than haphazardly from the dresser drawers, so hopefully they'll look nicer then!