A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
The act or state of corrugating or of being corrugated, a wrinkle; fold; furrow; ridge.
Source Anna Litvinuk
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
To get the repeating unit, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Abstract Tiled Background Extended 6
Source GDJ
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Dark blue concrete wall with some small dust spots.
Source Atle Mo
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
The classic notebook paper with horizontal stripes.
Source Are Sundnes
Remixed from a drawing in 'Kulturgeschichte der Deutschen im Mittelalter' Franz von Loeher, 1891. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
An alternative colour scheme to the original seamless pattern.
Source Firkin
Here is a new seamless wood texture for using as blog or website backgrounds.
Source V. Hartikainen