The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
The image depicts a pattern of regular hexagon.As I made to use it for myself,I want to others to use it.Speaking about the ratio of the image, height : width = 2 : √3(1.732...)Ridiculous to say,I realized later that this image is not honey comb pattern.I have to slide the second row.
Source Yamachem
The original enhanced with one of Inkscapes's filters.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
CC0 and seamless wellington boot pattern.
Source SliverKnight
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
Zero CC bark from fur tree tileable texture, photographed and made by me. CC0
Source Sojan Janso
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
The image depicts a seamless pattern which was made using stripe-like things including borders.I used OCAL cliparts called "Blue Greek Key With Lines Border" uploaded by "GR8DAN" and "daisy border" uploaded by "johnny_automatic".Thanks.
Source Yamachem
Abstract Ellipses Background Grayscale
Source GDJ
Prismatic Polka Dots 3 No Background
Source GDJ
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Prismatic Hypnotic Pattern No Background
Source GDJ