stiffened doilies... you could also use the inexpensive paper doilies, stiffen them with a white craft glue & very lightly sprinkle on some fine glitter. these could then be used as an ornament on the tree... gift tags... ???
To make a 3-D snowflake, cut out six identical designs. Fold each in half like a book; glue back sides together, repeating until all are joined. Hang flakes on loops of thread or monofilament; attach to the ceiling with white paper tape.