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
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Zero CC tileable bark texture, photographed and made by me. CC0
Source Sojan Janso
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Not even 1kb, but very stylish. Gray thin lines.
Source Struck Axiom
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
Colour version of the original seamless pattern.
Source Firkin
Geometric triangles seem to be quite hot these days.
Source Pixeden
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
Classic vertical lines, in all its subtlety.
Source Cody L
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Spice up your next school project with this icon background.
Source Swetha