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Hi...here is another method for if you have patience.
Open up frontpage...Frontpage has the knack of copying images as well and the generated (though dirty) code.
copy your main page (the one that is live)
Save it.
Using Dreamweaver? Open your live page, view source copy and paste the source into a new dreamweaver page.
Save the file as Loal_tester or something.
Remove style references, make it so that it the style sheet of the theme folder you saved it in is attached.
Its like a breathing snapshot of your page.
Preview...you can get an idea of how the theme is looking.
THough certain spacial issues (Ive noticed block padding is not always accurate with frontpage, being more so with dreamweaver) are a bit different you can get an idea of the primary elements and use it as a quick and dirty way of testing out some style choices. Also if there are image references specific to that theme (such as a background image or so, it wont call those it will call the absolute urls you copied...you can change these or choose not to for testing purposes. Its a bit o work maybe but once you have a local rough test page for your theme its quite useful.
Particulary useful for the Main Menu, user menus, and the Blocks.
Styles that are specific to the themes style sheet (like sometimes a clever name is given for a td header) will have to be changed to the corresponding ones in the style sheet as well.
If there are elements added into theme.html of the theme you like you will have to add these to the test document. Though you can do this later.
Maybe not quite what you are looking for but: It's rough but
Either way its a great way to learn what controls what via the style sheet, etc.!
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