Last weekend we invented a new Four Square variant (inspired by a comment from Molly) called T-Rex Four Square (or Four Squaraaaar according to my friend Josh) in which your elbows must always be in contact with your torso. This turns out to be a stupid amount of fun, and the pictures on flickr (in this set nearby this photo) illustrate that.

It occurred to me last night that perhaps a pirate varient (Four Squarrrrrrrrrrre?) in which plays keep one eye closed might also be fun.