For a longer version of this update, you can read my blog post here: http://www.nathalielawhead.com/candybox/tetrageddon-games-now-on-github-the-enti...

But basically all of Tetrageddon.com is now open source, on Github: https://github.com/alienmelon/TetrageddonGames

This includes all art assets, code, sound work... The Flash games are also hosted separately (read the readme for that).
Hope you have fun with it!