Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
One more updated pattern. Not really carbon fiber, but it’s the most popular pattern, so I’ll give you an extra choice.
Source Atle Mo
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
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
A seamless pale yellow paper background with a pattern of animal tracks.
Source V. Hartikainen
Prismatic Groovy Concentric Background
Source GDJ
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Traced from a drawing in 'Household Stories from the Collection of the Brothers Grimm', Wilhelm Carl Grimm , 1882.
Source Firkin
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
A seamless texture of an abstract wall colored in shades of light orange brown.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin