Geometric triangles seem to be quite hot these days.
Source Pixeden
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Prismatic Geometric Tessellation Pattern 4 No Background
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Sharp pixel pattern, just like the good old days.
Source Paridhi
Abstract Ellipses Background Grayscale
Source GDJ
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
Background Wall, Art Abstract, white Well & CC0 texture.
Source Ractapopulous
A seamless paper background colored in pale yellow.
Source V. Hartikainen
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
This one is amazing, truly original. Go use it!
Source Viahorizon
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
A grayscale fabric pattern with vertical lines of stitch holes.
Source V. Hartikainen
Looks as if it's spray painted on the wall. You can be sure that this pattern will seamlessly fill your backgrounds on web pages.
Source V. Hartikainen
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin