When the TD was first created, there really weren't any options except for rotating text, and only for the case of languages reading left-to-right, top-to-bottom, versus languages reading top-to-bottom, right-to-left... or something to that effect. Basically, it allowed you to rotate text 90 degrees.
Now you can use Internet Explorer filters, and they work on text and images. Try this: In your main, outer column or row, double-click to get the Row/Column Properties. Press the HTML Styles button. Create a new style called "filter". Set the value to: progid:DXImageTransform.Microsoft.BasicImage(rotation=1). This will rotate the entire screen 90 degrees. Change the rotation value to 2 for 180 degrees, or 3 for 270 degrees.
This may have some side effects. When I tried it with the default layout, the center column of cells suddenly had no background color. Actually, it appears that they somehow inherited the "transparent" background color of the center column, although they did have background colors set. I fixed this by simply setting the screen background color. That might not work for you, or you might experience other side effects.