The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Abstract Background Design No Black
Source GDJ
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A repeating background for websites with a texture of black groove stripes.
Source V. Hartikainen
Prismatic Geometric Pattern Variation 2 With Background
Source GDJ
A seamless texture of a rough concrete surface.
Source V. Hartikainen
From a tile that can be had 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
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
Inspired by a drawing in 'Poems', James Smith, 1881.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0
Source Sojan Janso
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Prismatic Curved Diamond Pattern 4 No Background
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
Use shift+alt+i on the selected rectangle in Inkscape to get the tile this is based on
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin