Quest For A Challenge

So, one of my mail goals with this blog is to come up with different personal and family challenges.  I will be making a page specifically for that purpose.  In the mean time, I need to brainstorm some ideas and whether or not to just find some, or make my own.  So far I know I want to be a better parent, get healthier, become more organized, be more active, live frugally and live greener.  What are some awesome challenges out there?