The snooze-packer project has been released today.
Packer eases the virtual machines process creation. You could check the packer web site for further information.
Now, We use it to create virtual machine images and prepare it with the contextualization script (see the of the documentation).
Checkout the snooze-packer project for the first images provided with the tool : https://github.com/snoozesoftware/snooze-packer