In terms of caring for the real greenery, I found some great tips on Cityline, they recommend spraying outdoor wreaths with Wilt Pruf (available at Sheridan Nurseries) and indoor wreaths with water (approx once a day or so depending on the greenery).
Anyway, without further adieu, here is my DIY Christmas Wreath. PS - I love the new trend of simply draping the ribbon over the wreath.
Here are the things you will need.
First, put on your gloves (sap is like nature's glue gun), I learned my lesson from my DIY Christmas Planter post : )
Next separate your greens into groups of small, medium and large. Grab one from each pile and tie them together with a twist tie and attach it to the wire of your fake wreath.
Make sure all your bunches point the same direction.
Do the same thing with your pine cones. In this case I used the glue gun to attach.
Here is the finished product. You could also try this with your artificial Christmas tree ; )