A dark brown fabric-like background texture with seamless pattern of winding stripes.
Source V. Hartikainen
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
It looks very nice I think.
Source V. Hartikainen
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
ZeroCC tileable moss texture, photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A seamless background texture of old cardboard.
Source V. Hartikainen
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
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Kaleidoscope Prismatic Abstract No Background
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem