Hi MrBragg,

I don't know what degree of realism you're aiming for, but in the past I've used Arsheesh's tutorial at http://https://www.cartographersguil...heesh+tutorial. You might have to tweak the gradients to produce more variation in colours, however, but overall I was rather satisfied with this method. Tiluchi's method will probably yield more realistic results, but I still recommend Arsheesh's just for comparison.

Looking forward to the final product!

Peter