This is a great initiative and one that I would to be able to be a part of but I have such a hard time coming up with things to do. I have only made a few contributions to open source projects previously and all those were cases where I was using some open source library with limitations or flaws that I had to fix in order to be able to use them in my software and where I fixed them first for me and then decided to share them back with the world. In many cases I added or modified functionality through multiple checkins that amounted to rather large pull requests. I just have a hard time seeing how I will be able to a) find anything worthwhile to contribute and b) be able to do so every day.