I got a good one, albeit early, but hear me out here..
We are lucky enough to be part of a great community (Arcanix of course!) that plays an amazing game. One of the highlights of this game for me, is that I don't have to shell out $20 a month to play it. I played WoW far too long and paid way too much for an experience that could have been free.
Now here's my challenge, and my vote is to make it a
December challenge. Take that $15 USD or w/e the cost of a subscription game would be for the month of December and donate it. Doesn't matter where, but try to make sure it ends up with an organization that is aiding children over the holidays. I think we take a lot for granted in our lives, and the fact that so many of us are able to build these gaming machines, buy the games, and spend all evening playing them, says a lot for the comfort that exists in our lives.
So very plainly, my challenge is to donate some cash this/next month to some children who don't get the same vidya game experience that we probably had growing up. Don't get too caught up in buying all the xmas crap that will show up in the gem store, instead, make someone else smile.
Proof will be awkward of course, but you can throw a screenshot or a pic up, or just be honest.
One organization I've heard a lot about (and personally donated to, both privately and via the Humble Bundle's) is Child's Play (
http://www.childsplaycharity.org/testimonials). Feel free to check out the website, I linked the testimonials specifically since it'll get you all right in the feels.
Personally, I work with children and can attest to how good a sense of achievement can be for a child. You may see a kid come to school or daycare every morning and know they just had a shitty night and day. They probably got yelled at, they probably didn't have enough to eat. But I'm telling you, you watch that kid laugh and smile as they complete a new level in Super Monkey Ball, and you'll understand the healing power of vids..