OK, here's an example from me:
Here we see an easyJet 737 on final for EGGD on a summer's evening.

And, by reducing the visibility to 20 miles, adding a layer of Stratus clouds (5/8, about 4000ft to 8000ft) and a layer of Cumulus clouds (7/8, 8000ft to 16,000ft) and moderate rain, this is the result:

As you can see clouds add action. Instead of creating a peaceful atmosphere, a slightly cautious one is created - also on the approach I was banked slightly left giving the indication of moderate winds (there weren't any but the same effect would be found with crosswinds). Also rain helps to create drama by implying speed into an image. :)