An attempt for cleaning up the original image in a few steps.
Source Lazur URH
A seamless background texture of old cardboard.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
A heavy hitter at 400x400px, but lovely still.
Source Breezi
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
A white version of the very popular linen pattern.
Source Ant Ekşiler
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin