Oh, how I love calling it that. And wiggling my eyebrows suggestively when I call it that.
Nope, my class wasn't on marijuana. It was a free class sponsored by a local nursery that shows you how to decorate your porch pots for the holidays.
Once you've chosen your evergreens, you can choose some other fun elements to put in as your filler. Spray-painted pine cones, fake lotus pods that you can buy at a craft store, yarrow you've picked from a ditch bank and spray-painted, etc. She would pick the fun elements based on the colors of her evergreens. Like, those evergreens that have those weird looking blue-ish berry things on them - she would make her fun elements blueish. In her in-class demonstration, she had some evergreen branches with yellow-tinged needles, so she did a golden theme.
Lastly is your spiller. This can be more evergreens that you arrange to kind of spill over the pot, or it can be a big dangly bow, some big jingle bells or hanging ornaments, etc.
As soon as I have time (seriously don't know when that will happen, since I'm moving and all), I'm going to procure some pots and do this thing. I have a cute little porch in my new place to use, and I'm excited. I'll post a pic when I do it.