I've posted the rules to the game I've been working on which I mentioned on the contest thread. It requieres 2 sets (1 rainbow and 1 xeno) and it uses the color changing properties of the translucent pyramids to hide information. I'm still working on a couple of ideas for the contest, so I'm not sure this will be my entry... I also want to play it more and make sure it actually works... Any feedback, comments and ideas are welcomed...
Here's the link: http://icehousegames.org/wiki/index.php?title=Colorful_Clues