These are example templates to go with packer-community/packer-windows-plugins. Files ending in .example will need to be customized and may even require leg-work on your part (i.e., entering license-keys, downloading vm tools, etc).
These examples borrow heavily from this blog post and also these two fine repos:
I expect any advances made here to get rolled into joefitzgerald/packer-windows when WinRM in Packer is stable enough.