Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Looks like an old rug or a computer chip.
Source Patutin Sergey
Here's a new paper-like background for free use on personal and commercial projects (this applies to all background patterns here).
Source V. Hartikainen
Background Wall, Art Abstract, Watercolor Vintage style CC0 texture.
Source Ractapopulous
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
Alternative colour scheme for the original floral pattern.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Hexagonal dark 3D pattern. What more can you ask for?
Source Norbert Levajsics
Derived from an image that was uploaded to Pixabay by starchim01
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
Black brick wall pattern. Brick your site up!
Source Alex Parker