How can I achieve a "painted" effect in my scene in blender? I would like to model some rooms and offices and achieve this sort of look when in done: 





Im fine with modelling, but how can i go by in getting it to look like the style on these images? Is there a way to add a painted effect in blender to objects or even to the whole render? Or should I consider getting this look in post production in another program by applying effects?
The filters in Photoshop are your best bet. Gimp or Krita which are both free might also have such effects, but looking at the Blender compositon nodes i couldn't find any solutions. One thing that can be done in Blender are the lines using Freestyle. This will have the edges of all models show up and there are many advanced features regarding to this.