Here is a quick and effective method of creating an artistic image from your SketchUp model. It was originally posted way back in 2005 on the original SketchUp forum.
In short, you will export 2 images from your SketchUp Scene: a) Hidden Line Black/White image and b) textured one with shadows. Bring them together in Photoshop and then erase a hole in the Hidden Line layer with the colored textures showing through.
The whole procedure can take as little as 5 minutes.