Paint the whole block with desired colour - I mixed pyrrole red with burnt umber.
Mix a new colour and lightly brayer randomly over four squares. I mixed pyrrole red, hansa yellow medium with titan buff and a tiny amount of burnt umber. I left two opposite sides blank to take the photos.
Create another new colour and use a piece of card to dab into the paint and then onto the squares - this creates another random distressed layer. I added some black and white to what was left on my palate.
Randomly stamp some text with a lighter mixed colour - I added more burnt umber and titan buff to what was left on my palette.
Stamp a little texture with black archival.