The easist way to do this is to "hijack" the FormatPage functionality.
First add the following to your web.config in the newtelligence.DasBlog.UrlMapper section:
<add matchExpression="(?<basedir>.*?)/Static\.aspx\?=(?<value>.+)" mapTo="{basedir}/FormatPage.aspx?path=content/static/{value}.format.html" />
Now you can create a directory in your content directory called static. From there, you can create html files and the file name will map to the url like this:
http://BASEURL/Static.aspx?=FILENAME
will map to a file called:
/content/static/FILENAME.format.html
You can place anything in that file that you would normally place in itemTemplate.blogtemplate, except it obviously won't have any post data. But you can essentially use this to put other macros, and still have it use the hometemplate.blogtemplate to keep the rest of your theme wrapped around the page.