Vali Architects have made yet another great plugin for SketchUp called Instant Wall!  This plugin creates a wall, colonnade, arcade, railing or fence with the form and texture of your choice to drop onto your topography.  It will make wall parapets and end caps and pilaster caps.  And like many real-life walls and fences, the plugin allows for the item to stair step into the landscape. There are plenty of great examples about how to use Instant Wall.  The plugin costs $18, but when something does exactly what you need it worth every penny.

Here is a video overview:

Don’t for get to look at Instant Roof, Instant Road, and Instant Site Grader.