- Corrugated card
You could try anything and see what sort of effect you get, there are no rules. After applying the gesso you can then smear it around or scratch into it or add some sand or rice or even scratch words into it before you leave it to dry.
I basically create my whole painting in the textural layer. It gives the work so much more depth when I go to apply colour and opens up endless possibilities, its so much easier and more effective than working with a completely flat surface.