Re: Second bottom module area?
It's easy to make a custom module. You can use HTML or wiki syntax, so in this case you could probably make a div to contain the logos. When assigning it, specify nobox=y so only the module data is displayed, with no module borders, etc. You can give it a "containing class" class name in order to target it for styling, or just assign it and check the page source to see what class or id Tiki gives it. This module (div) would be 100% wide (full width of the module zone) and would have a background color to distinguish it, as in your design image.
The module zone itself would have its own background color, and the modules it contains would have no background, to implement your design. Any top border on the module zone or footer would probably have to be changed to a bottom border on the custom module, to visually separate the lower modules.
How does that sound?
-- Gary