Easily Customise RaspbianThe key feature of PiBakery is the ability to create a customised version of Raspbian that you write directly to your Raspberry Pi. This works by creating a set of scripts that run when the Raspberry Pi has been powered on, meaning that your Pi can automatically perform setup tasks, and you don’t need to configure anything.The scripts are created using a block based interface that is very similar to Scratch. If you’ve used Scratch before, you already know how to use PiBakery. Simply drag and drop the different tasks that you want your Raspberry Pi to perform, and they’ll be turned into scripts and written to your SD card. As soon as the Pi boots up, the scripts will be run.For more information on creating customised SD cards with PiBakery, please see the Creating an SD Card Guide.
Source: About PiBakery – The blocks based, easy to use setup tool for Raspberry Pi