The minimum size that the table wrappers will scale down to is 180 pixels wide by 30 pixels high. So you will see a limit to just how small the IIP columns will look. When I was doing testing on the table wrappers 180 pixels looked acceptable. Going smaller reduces the effects that can be done with the images to the point where it's better just to use a solid color instead of a gradiant.
For the chrome table wrapper, since all the images that you see are background images and there is no large horizontal gradiant, you could set the following table cells in the tbopen and tbclose templates to use a different width (listed by the CSS classes that control them):
- topleft
- topright
- botleft
- botright
I would set them all to the same size. Keep in mind that the forground transperant gifs are 10 pixels square so you won't be able to go below 50 pixels wide unless you change them as well.