Open a new file 3X3 make sure its tranparent then use the pencil tool
once you got three diagonal dots you do
edit> define pattern
once you got that do your siggah
use the FILL. at the top it has foreground and pattern pick pattern
then fill it like you do it in paint lol
then rub some of the diagonal lines out on the render
finally set it too soft mode zoom it to 100% to see the result
