If you like scratch, check out BYOB (http://byob.berkeley.edu/ http://byob.berkeley.edu/). It is just like scratch except you can "build your own blocks" - i.e.

If you like scratch, check out BYOB (http://byob.berkeley.edu/ http://byob.berkeley.edu/). It is just like scratch except you can "build your own blocks" - i.e. abstractions.