Mmm I dont think there is much use in saying much about my technique / process. I have a specific taste that I am pursuing. In such a way I’m using any and no technique to get my results. I did a small tutorial on drawing which is an exercise I do everyday.
Attached are a few colorplates. These are what I do to both practice color and also texture. Digital is an infinitely flexible medium and the only way to realize its capabilities is to try everything. They are all in similar value ranges so I can mixmatch “textureplates” within different paintings to imply different materials. I started thinking of textureplates after seeing a small tutorial by @theonides (link) where you see him recycling old paintings to get a “start” the difference is that I make these paintings specifically to turn into bases for paintings. Therefore I am much more free to just explore “arrangements”. Sometimes the rorschach idea comes in handy and I just “see a piece” but more often I do a sketch for a piece then do a texture plate that has the “mood” I’m after. And abstractly play with it’s arrangement before commiting to more detail. The textureplate is then saved on it’s own high-res jpeg file (I have a bit more than a hundred texture/color-plates now) to be used for drag-and-drop starts later.
How do I make my textureplates? Well the fun in them is that they are done while exploring different tools and techniques. Because they are abstract in nature they don’t have to “be” anything. Try color dodge, sharpening at 100% (for super noise), the clone stamp tool (a tool which @tomscholes uses a lot) Try anything! Try those tools you’d never use in any other place make completely broken pictures.
I don’t want to deprive you that pleasure of discovery!
So sit down and work with it in an honest and true way and don’t go for a certain “goal” take the pieces you already have and play :)