One of the novel features of Galaxie Blog is that it lets you assign a post to a unique theme. This gives you complete control over the design of a post. It also allows you to showcase your photography while on a road trip or create various holiday-based themes to wish your users happy holidays! 

To see this in action, see my blog post announcing Galaxie Blog. Notice how the delicate arch that I drew matched the background theme? I used this very picture when drawing the Delicate Arch scene!

To assign a post to a theme, use the Post Editor and click the Set Theme button in the miscellaneous section. A new interface will open up. Select your desired theme and click the submit button.

This theme will now be selected when your users visit your blog post. Note: this will not affect the blog landing page with multiple blog posts.