In Sweden, the crowns are decorated with lingonberry leaves and red ribbons.

If you can't use lingonberry leaves, boxwood is a good alternative. (You can get it at most flower shops). Or choose your own greenery: ask the florist to suggest something that won't wilt. Cut the boxwood into 3- to 6-inch pieces.

Cut wire to fit crown, plus two inches for overlap.
attach boxwood to wire, using additional wire or strong thread.

Bend wire into crown shape, overlap ends, and tie together.

Attach boxwood wreath to your Lucia crown by winding red ribbon around both.

Now it's ready for Lucia to wear!