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
A seamless pattern formed from a tile made from ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Coming in at 666x666px, this is an evil big pattern, but nice and soft at the same time.
Source Atle Mo
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
The image depicts a shell seamless pattern.I used an OCAL clipart called "Shell" uploaded by "jgm104".Thanks.
Source Yamachem
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
A background tile of dark textile. Made this a long time ago and just now decided to publish it.
Source V. Hartikainen
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
You guessed it – looks a bit like cloth.
Source Peax Webdesign
Black And White Floral Pattern Background from PDP.
Source GDJ