Scratch is a free and easy to use piece of software that developed by MIT in the US.

There are tons of great resources online to learn how to use it with a lot of good examples of projects that you can work with.

Featured projects are here: http://scratch.mit.edu/channel/featured

The full galleries of what’s newly been uploaded are here: http://scratch.mit.edu/galleries/browse/newest

A great tutorial video is here: http://www.youtube.com/watch?v=pkhjX792yVI and there are a lot of other videos in the playlists down the right hand side.