For my Halloween wreath, I used this Etsy wreath as a jumping off point. Instead of wrapping the wreath form (I used a straw form instead of foam because it was cheaper) in fabric, I used yarn (acrylic yarn, THE HORROR). It probably took about 2 hours just to wrap the wreath, and I'm pretty sure I gave myself the crafting equivalent of tennis elbow in the process.
I bought the felt bat from Michaels, and for the flowers, I used several different tutorials (mostly this and this). Several glue-gun burns later, I had a wreath that I totally love! Fall is my favorite crafting season (and favorite season), so I don't care if it's still 90 degrees out, I'm milking every minute.