installing wordpress onto existing site without using themes?

Hi,

I’ve installed wordpress onto my site at http://www.dannypaynephotography.com/blog

What I am trying to do is create a new page, say blog.php , that takes the php feed from dannypaynephotography.com/blog and places it in this new page, thus allowing me to edit the whole site using one css file.

anyone know how you do this? Everything I seem to read on the internet about integrating blogs always seems to talk about adding themes and such, which seems to defeat the object of CSS. Ideally, I just want the blog to provide an unformatted html output (like php should) so I can format it myself using css.

Is this possible?

Cheers
Danny