There are five layout options included with the Tranquility II DNN skin.  However, don't let that statement fool you.  There are numerous layout options available based on the layouts.  The 3-column and 4-column designs allow for one column, two column, or three column layouts, and a fourth column for the vertical menu, or any combination of the above.  Take a look at the schematic design for each option by selecting from the menu below or the main menu in the page header.  Tranquility II adds in the vertical menu layouts not present in the first version of the skin.