The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
This one is amazing, truly original. Go use it!
Source Viahorizon
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
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
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
A heavy hitter at 400x400px, but lovely still.
Source Breezi
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is a remix of "geometrical pattern 01".
Source Yamachem
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A nice and simple white rotated tile pattern.
Source Another One
Utilising a bird from s-light and some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
There are many carbon patterns, but this one is tiny.
Source Designova
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
A free background tile with a pattern of pink bump dots. This background tile is sweet! Moreover, it's designed for use as website backgrounds.
Source V. Hartikainen
A repeating background with seamless texture of stone. There haven't been any stone-like backgrounds for a while, so I have decided to create one more. The rest can be found in the appropriate category.
Source V. Hartikainen