Grainy I have had a lot of comments and questions about some of my grainer art. Again - I'm not here to tell you every step that I take - but merely share some useful information that you can adjust and build upon to suit your style. NOTE: The one that I am going to layout is pretty detailed and you can stop during any time during your implementation if you get the exact effect you want.
Still on layer 1, use the Image Toolbar and click adjust -> brightness/contrast -> settings at +5 brightness and +24 contrast -> click ok.
Create a new layer [above layer 2] - this will now be layer 3.
Apply the Filter render -> clouds -> click ok. [clouds utilizes your two colors (background/foreground) so make sure one is darker and one is lighter].
On layer 3, apply the Filter sharpen -> sharpen more -> click ok.
Still on layer 3, click on the Image Toolbar -> adjust -> brightness/contrast -> settings at +27 brightness and +65 contrast -> click ok.