Had a lot of trouble working with textures, I wanted the colours to be brighter but I couldn't quite manage to achieve it. There's also a huge difference between the 300,150 and 70 dpi versions. I may be using a grain that is too intense because the lower the dpi I selected, the closer it got to the desired effect that I was looking for.
I also found out that you can directly add additional fills on the same object within the appearance panel without having to create a copy of the object. Works for overlapping fills but probably won't work if you want to add a little gap between the actual object and the textured shadow. Still, hope this helps! (: