Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
Prismatic Curved Diamond Pattern No Background
Source GDJ
Here's an yet another seamless note paper texture for use as a background on websites.
Source V. Hartikainen
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen