Okie doke, Here’s an update.
I’ve finally found time to work on the textures for the rocks.
I started out using this tutorial that I believe 3dbanana suggested (https://www.youtube.com/watch?v=FHeBI5tAGP0) . I worked through this and created a similar texture. I also downloaded and appended the source files to go through the node structures and compare what I had created.
I then hacked the texture to pieces and took out elements that I didn’t think worked for this project. I also messed around with a lot of the scaling and colours to make something that suited the style of the spice vendors’ rocks.
As this texture is built using an emission shader I then baked out the textures into PNG’s.
Here’s the wonder procedural rock nodes

Rock with just normal map:

Rock with just texture:

Rock with baked normal and texture in dark light

Rock with baked normal and texture with sunny field HDR:

Here’s all of the together

As @jlampel mentions above, i still need to increase the poly slightly on these rocks.