Avant Gaming and WoW Insider reported on the rising emergent play with WoW's newly implemented Guild Banks. Guild members are utilizing the Banks slots as game boards for checkers, Connect 4, Tic-Tac-Toe, and even Pictionary, but short of one row to play chess:

No, the point of this post is a new use of the guild bank that has nothing to do with storage: checkers! Affix, from Tichondrius-A, has discovered that the bank is good for fun as well as utility. One player is using Netherweave, the other is using Arcane Dust, and they both seem to be having a good time. I have to say, this is the first time I've seen somebody playing a minigame inside WoW without AddOns or anything. Drysc speculates that chess would be somewhat viable, despite the fact that there is one row too few, what with the variety of item icons that exist. Tic-tac-toe should obviously work as well, though that's a fairly trivial game to not lose...

For a more functional use, check Evol's unofficial Guild Bank FAQ on our forum!