I was home for Thanksgiving and helped Dad with the Christmas wreath he puts together every year. I didn't realize that he'd done this for 30 years. Having just signed up with instructables, I thought I'd share his process.
Step 1: base
Dad bought this base 30 years ago. It's home/shop made: some peg board cut into a circle attached to a bent and welded together at the ends re-bar, painted green on the other side. Dad attached some bailing wire to it to hang it on the house. That's 30-year-old bailing wire there.