I scanned a paper coffee cup. You know, in case you need it.
Source Atle Mo
A comeback for you: the popular Escheresque, now in black.
Source Patten
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
From an image on opengameart.org shared by rubberduck.
Source Firkin
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Tiny circle waves, almost like the ocean.
Source Sagive
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on 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
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
There are many carbon patterns, but this one is tiny.
Source Designova
The image depicts a seamless pattern of a snow crystal.I referred to a book called ”sekka-zusetsu” or "雪華図説" which means an illustrated explanation about snow crystals.This book was published in 1832 (天保3年) or Edo period.For more about "雪華図説",see here:dl.ndl.go.jp/info:ndljp/pid/2536975
Source Yamachem
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
Just like your old suit, all striped and smooth.
Source Alex Berkowitz