Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
The image depicts a seamless pattern made using a bird's face.
Source Yamachem
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
A black tile-able background with paper-like texture.
Source V. Hartikainen
Super detailed 16×16 tile that forms a beautiful pattern of straws.
Source Pavel
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Prismatic Abstract Geometric Background 4
Source GDJ
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
Pattern formed from simple shapes. Black version.
Source Firkin
Prismatic Hypnotic Pattern No Background
Source GDJ
This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.
Source V. Hartikainen
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
A seamless background of warped stripes on paper.
Source V. Hartikainen