Underwater photographs.  I’ve mentioned before that I often desaturate them, as the colors bring nothing and often distract. This is not always the case, however.  Take this image:

Swimming through Cathedrals I

Normally I would have converted to black and white.  This time it felt better in color: the tonality in the blues speak to the depth, and the enclosure, and the escape from said enclosure just outside. The heavier feelings associated with blues also speaks to the overall gloom of such an environment.

So a reminder to self: just because the typical rule would be to desaturate, always be sure to review it in color.