Just make rice-krispie treats and shape them into balls. I go heavier on the cereal in the cereal to marshmallow ratio so they won’t be quite as sticky.
Put icing (I use store-bought) in a sandwich bag and poke or cut a hole in the corner so it can be used like a pastry bag. The bags I got had the expandable bottom, so it worked better for me to just poke a hole into the bag because when I tried to cut the corner, it would squeeze out of two places. (The above picture is me holding the bag. It is not a marshmallow.)
Use the icing like glue to put on Twizzlers (the string kind) and candy and decorate it like an ornament.
Ooh and aah and take a few pictures.
I think I found this in Family Fun Magazine last year. It said to use popcorn balls, and last year I did. Rice krispie treats are MUCH easier!