Draw, in Biro, a silly dinosaur on a soon to be demolished kitchen wall. Explain to small children that you should never draw on walls and that Daddy had been a bit naughty!
Take a picky of the drawing, import it into a drawing package and make the drawing layer a ‘Multiply’ Layer. Explain that it is not just Biro that you should not draw on walls with – it’s all pens or pencils!
“No, not crayons either”
Create a ‘Normal’ Layer under the drawing Layer and block or blob in your colour. Explain again that in hindsight Daddy had been very silly and should never, ever, have drawn on the wall.
Find a (royalty free) texture on the internet without much colour information (greyscale) and use it in an ‘Overlay’ Layer, rubbing out the bits you don’t want to create a bit of texture – a leather texture in this case. Add your poncey signature and explain that because daddy was silly and drew on the wall, the wall now has to be demolished!