The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
Looks like an old wall. I guess that’s it then?
Source Viahorizon
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
An alternative colour scheme for the original seamless texture formed from an image on Pixabay.
Source Firkin
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Abstract Tiled Background Extended 11
Source GDJ
Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Classic 45-degree pattern, light version.
Source Luke McDonald
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
Cubes as far as your eyes can see. You know, because they tile.
Source Jan Meeus
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ