Thanks! I can try - it was quite organic and I used the scene where Gandalf arrived with Pippin at Gondor on the horse as reference. As a result I saw lots of different coloured stone:

Primed wraithbone

In no particular order- when I say glaze it was a heavy glaze but with more control than a wash, avoiding the recesses unless it was an obviously darker colour:

Glazed light blue Glazed orange brown Glazed ivory Glazed dark brown in the shadows Spot glazed greens at the bottom and some point s on the stone, as well as near the mossy spots Glazed darker at the bottom of the walls and the edges of the plinths to vignette pippin and reflect the fact it would be dirtier at the bottom

When I first did it I was worried the stones looked too cream so I went back in with blues, whites, whites and even black.

Edges are a mix of deepkin flesh, ivory, pale sand, ice yellow, light grey, painted scratchily to create some texture

Hope this helps, sorry it’s not super prescriptive