Sketchy Shadows is a feature of NprTools , which creates shadows using sketchy edges or Sketchy Patterns from your SketchUp drawing. It replaces the harsh, solid shadows created by SketchUp with patterned shadows to really improve your Non-Photorealistic Sketches.

Check it out at: Sketchy Shadows

HDRi Skies and backgrounds provide a full, 360 degree, image used for the visual background, as well as lighting and reflections. This adds great realism to your exterior renderings.

We have added a new Lighting Preset for HDRi Skies which automatically places clouds and sky behind your model.

See the new HDRi Sky Tutorial .

Check out Tony's SketchUp Modeling Blog.
Here is a recent post called Sketchup the way I like it a lot

From Tony: "This is a combination of real handmade sketches, imports from 2d cad drawings and 'foam core' SketchUp modeling."