A couple of fox cubs were playing in the backyard a couple of evenings ago. Low light, fast moving subjects and a window pushed up the ISO so I went creative with the PP. Without the high ISO I wouldn't have been able to get the shots at all, so yes, it's actually useful.
Waterpaint colors with what I tried to transform the noise to look more like film film grain.
Exposure 0.01 sec (1/100)
Aperture f/2.8
Focal Length 200 mm
ISO Speed 10000
Here I went all soft on the look and find it somewhat beautiful.
Exposure 0.003 sec (1/400)
Aperture f/2.8
Focal Length 200 mm
ISO Speed 20000