I have been a fan of Scratch from the very first time John Hendron showed it to me about seven years ago. I am not the most prolific or creative Scratch user out there, but I love to play around and make animations and games. The projects I like to share when I talk to educators are on my Scratch page.
My most ambitious project is a game in which a car drives across a field full of cows. As far as games go, it is very silly. But, I learned a lot putting it together: variables, random numbers, scorekeeping, etc.
Scratch is the quintessential learn-by-doing tool for students. There are no wrong answers and no limits to how far you can take this tool.
If you want to connect with educators using Scratch, be sure to check out the ScratcED website.