Simple! Just lay the pipe cleaners with the centers touching and hot glue them together. (The original instructions read to bend and twist them together in the middle, but I found they tended to fall apart.) Next, tie the charms onto the ribbon PRIOR to gluing the ribbon to the center of the snowflake.
I hang these in our family room (which is really our sunroom/my office but everyone hangs out there!). I add my daughter's art work and silly snowman collection too! She thinks she has her own snowman/snowflake room - well, I guess she does!