A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Zero CC tileable ground (#2) cracked, crackled texture, made by me. CC0
Source Sojan Janso
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Classic vertical lines, in all its subtlety.
Source Cody L
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo