I'd like to propose an activity. More like invite you all to an activity, I suppose. I'm developing a pixel-art collaboration called Yono. The structure of Yono is that each new piece added extends another piece already in the structure by inserting itself in between the halves of the "parent". Each image can have two children -- one in the horizontal direction (inserted between left/right halves), one in the vertical direction (inserted between the top/bottom halves).
Here's an animated logo for the project I made that shows how images insert inside other images:

So, as images continue to get added, the Yono structure becomes a tree of images that you can only see by crawling around interactively, expanding and collapsing links. You really have to see it to fully grasp the nature of this beast. I have made a prototype navigator --
http://sito.org/yono/navigatorBeta.html -- for this. Try it out and let me know what you think!
If you'd like to add pieces to this growing project, just drop me a line here or via links on the main Yono page --
http://www.sito.org/yono -- and I'll set you up with a slot. Pieces are 64x64, with a mutating 16-color palette. Each image uses the palette of its parent image, but may change up to 4 colors.
Currently, I'm putting it all together by hand (editing the data files, uploading the images), but our ultimate goal is to automate the entire thing so people can reserve/upload their pieces via the web. Also, we want to set it up so articipants can set up their own custom Yono Uchus (cosmoses) with specific parameters.