You can make this boutonniere complete by stopping at this point if you wish. Many boutonnieres are simply ribbon wrapped and then pinned to the tux lapel.
But I like to pump up the style by adding a colored wire wrap. I offer several different size gauges (the diameter of the wire), all available in a wide range of colors to suit even the pickiest bride.
For this boutonniere tutorial, I'm using Oasis Decorative Wire in a 12 gauge size. It is very mallable (easy to bend) and comes in 17 popular colors. The generous 39 foot roll lets you add the accent to all your corsages and boutonnieres.
Insert the cut end of the wire into the back of the boutonniere, deeply burying the point where it can do no harm.
Wrap this flexible wire down the stem. You can see I've allowed the white sheer ribbon to show thru behind the wire.
Cut off at the end, leaving a tail that you can curl up.
I gave the wire a twist, creating a decorative loop at the bottom as a pretty finish and tucked the end up behind the boutonniere.