A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
Prismatic Groovy Concentric Background 3 No Black
Source GDJ
Prismatic Hypnotic Pattern No Background
Source GDJ
Black brick wall pattern. Brick your site up!
Source Alex Parker
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Floral Background No Black
Source GDJ
This is sort of fresh, but still feels a bit old school.
Source Martuchox
Embossed lines and squares with subtle highlights.
Source Alex Parker
A seamless green background texture. The image is distributed under a Creative Commons License (like all of the images here).
Source V. Hartikainen
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
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
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
A hint of orange color, and some crossed and embossed lines.
Source Adam Anlauf
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
It’s like Shine Dotted’s sister, only rotated 45 degrees.
Source mediumidee
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen