Embossed lines and squares with subtle highlights.
Source Alex Parker
Super subtle indeed, a medium gray pattern with tiny dots in a grid.
Source Designova
There are many carbon patterns, but this one is tiny.
Source Designova
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
An orange vertically striped background pattern. Feel free to download and use this orange background pattern, for example, on the web). It resembles a wallpaper with vertical stripes or something similar to it.
Source V. Hartikainen
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Not a flat you live inside, like in the UK – but a flat piece of cardboard.
Source Appleshadow
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
This is the remix of an OCAL clipart called "Art Nouveau ornament" uploaded by "microcosme".Thanks.This is a seamless pattern of an Art Nouveau ornament.
Source Yamachem
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Pass parameters to the URL or edit the source code variables to configure the graph paper for the division desired.
Source JayNick
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics