You could use the nokia theme studio,copy all the sis files into Program files\Theme studio\data\skins dir and then open theme studio,click on sis files and then select the theme you want and various screen shots will show,double click on the screen you want and then on any other screen,so the image is shown in the correct size (176x208) then alt+print screen and copy to your paint program,then cut out the 176x208 screenshot.
This is assuming you no longer have the phone lol

EDIT: Some of the screens may look incorrect if the theme was created on a different version of theme studio to the one you have.
And be careful not to upload any pay themes to the gallery,as they were not created by you.
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Thanks aLot. Will do that.