This was inspired by a tutorial from Gleb Alexandrov on roughness (http://youtu.be/QwxNhf8kSmU)

 

Utilizing roughness textures produced a strikingly realistic frosted window scene. I was going for a very uninviting, cold, wintery feeling with the low lighting, which turned out well. I could have put more work in on scene composition and structure, but it was only a practice model.