Hi, the blog module and corresponding page templates are included in the Alloy Technologies demo site for CMS 6, which can be downloaded here:
If you go to the download section on World, and then select either CMS 6 or CMS 6 R2 from the dropdown list, all the modules like Public Templates, Alloy Technologies and Springshield demo sites should be available for download.
Unfortunately the blog module is not available in a standalone module package.
If you want to extract just the blog functionality and page templates into another project, here's a blog post about which files and config settings you'll need (the blog is written for CMS 5, but it hasn't changed much in CMS 6):
Hope this helps get you started.