If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
A seamless pattern formed from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8
This one has rusty dark brown texture.
Source V. Hartikainen
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This white background pattern has a seamless grunge style texture. Here's a white grunge style background pattern. Use it as a tiled background image on web sites or for other purposes.
Source V. Hartikainen