Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Element of beach pattern with background.
Source Rones
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
If you want png files of thisu can download them here :
Source Viscious-Speed
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
Seamless pattern the basic tile 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
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green