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
Colorful Floral Background 3 No Black
Source GDJ
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
I’m guessing this is related to the Sony Vaio? It’s a nice pattern no matter where it’s from.
Source Zigzain
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
A heavy hitter at 400x400px, but lovely still.
Source Breezi
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Remixed from a raster on Pixabay that was uploaded by ArtsyBee.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin