This is so subtle you need to bring your magnifier!
Source Carlos Valdez
A smooth mid-tone gray, or low contrast if you will, linen pattern.
Source Jordan Pittman
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Prismatic Basic Pattern 2 No Background
Source GDJ
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
Zero CC tileable hard cover red book, scanned and made by me. CC0
Source Sojan Janso
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Colour version of the original seamless pattern.
Source Firkin
A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
A white version of the very popular linen pattern.
Source Ant Ekşiler
Spice up your next school project with this icon background.
Source Swetha
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ