Well, I had an idea a moment ago: How about we all dress up our Miis for the holidays?
Not entirely sure how we'd do this, but I screwed around and made my Mii pretty festive-looking by giving him red shades and a green shirt.
Before:

After (also changed face a little):

I'm not sure how quickly Miis update over the Friends list (or if they do at all), but this seems like a fun little thing for the community to do.
What are your thoughts?