The great site trekcore.com again has some awesome screencaps. These are some shots of the original Enterprise (from the HD-DVD set I think). An example of one below (but I shrunk it down a lot).
More here: http://tos.trekcore.com/hd/thumbnails.php?album=33 (http://tos.trekcore.com/hd/thumbnails.php?album=33)
(these would make some great wallpapers)