We've made a whole lot of templates for different types of blog posts. However, we also want to do fully custom 'power pages' that do not follow the WordPress theme we are using. These pages would be custom from top to bottom.
Here is an example to illustrate my point:
The above is a normal blog post with the header, footer etc styled as per the blog.
However this post on the same blog is totally custom We would like to do the same thing as the second example. What is the best way to go about this?