The image depicts a seamless pattern made using a bird's face.
Source Yamachem
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
A classic dark tile for a bit of vintage darkness.
Source Listvetra
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
To get the tile this is formed from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin