How to mimic sketchy lines in SKP

I would very much like to recreate this line style in SKP without exporting to photoshop etc. is this possible??
If not possible in SKP, are there any extensions available?

Yes, this look is easy to create in SketchUp using some of their style presets. That image very well could have come directly out of SketchUp.

How would I go about doing it?

Open up the Styles palette and select something like “Pencil” from the presets. This will create the sketchy line drawing style. From there you can customize the style to include basic solid color materials, such as a yellow as in the example.