I've had tip #71 by Magic Tip in my possession for months, but I've never used it. I was never really sure what the point of it was; it's basically a star tip that looks like it's been stepped on (it's flat on one side). As I was pondering which tip to use to pipe a Christmas wreath, I gave that one a try and I think it worked quite well. You'll also need a small round tip like the #2 to pipe berries, and a tip to pipe the bow; I used the petal tip #101. You'll also need a flower nail, a Styrofoam block to rest the nail in, parchment paper squares, a glue stick, and a dusting pouch filled with a 50/50 mix of powdered sugar and cornstarch. Start by sticking a parchment square to the flower nail with a dab from the glue stick.
Hold the tip, flat side down, against the surface, and rotate the nail more slowly than you pipe; your pressure should be fairly firm. This is what will cause ruffles to form. When you reach the point where the two ends meet, overlap the ends a little, stop pressure and pull the tip away. You might neaten up this area with a fingertip after touching it to the dusting pouch.