I am loving all sorts of earthy and organic things lately, and I found a great tutorial on Miss Mustard Seed's blog on how to make a DIY Mossy Wreath for about 5 dollars. You can read her step by step tutorial here. She also covers making mossy topiaries in the same post.
You might want to put some newspaper down as its a pretty messy project- be prepared with a broom and dustpan for afterwards! Totally worth it though! Love Love Love....although I used a navy blue ribbon I had in my stash, I want to change it to a chocolate brown ribbon when I get a chance - but I did not want to delay putting it up on my wall!