There are a couple of things you can do with paper texture that isn't immediately obvious until you mess around with it a bit.
For example, you can set the paper grain image to be a digital photograph, then rub a chalk lightly overtop to create a 'rubbing' of an image. If you then replace the paper texture with standard paper, you can touch up the result slightly.
(If you're using a mouse, when I say 'press lightly', adjust the pressure radial control for the tool to give the same effect)
Similarly, if you load a digital photograph as a paper grain, make the paper metalic silver, then use the crayon tool in various shades of metalic gold to rub at different pressure overtop, you can get gold-burnished silver.
Varying the pressure you rub with the crayon tool varies how deep it pushes into the crevasses and dips in the paper, so if you press heavily with one colour, then choose another colour and rub lightly overtop, you can get layered highlights.
Note: The images have loaded in reverse order - bottom to top - so stand on your head to view in correct sequence.