Playing with gray, rocks and watercolours

Here is a series of small watercolours that has emerged in the last few weeks as "thinking pieces".
They are small (5"x7") and I just love to do them. I start with washes of complimentary colours which creates
warm or cool neutrals and then draw into the wet surface with a watercolour graphite pencil. I don't know
why I have such an affinity for rock but even when I try NOT to paint rocks, they just appear out of nowhere.
I like the last one in the series, it appears as though the rock is cracking open and a light is appearing.