I went through a mitten phase this past winter. The problem was that I would come up with more and more ideas as I was knitting, and I had a hard time being disciplined enough to actually knit two of each kind. I also blogged about my mittens here on my Japan blog. Here are some of the results:
Used off-white wool with a thread of metallic silver purchased at Tokyu Hands.
Used thick synthetic yarn from my local 100￥ Shop.
The variety shot: