A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Remixed from a drawing in 'Maidenhood; or, the Verge of the Stream', Laura Jewry, 1876.
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.
Source Bartosz Kaszubowski
Used a cherry by doctormo to make this seamless pattern
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Seamless Prismatic Quadrilateral Line Art Pattern No Background
Source GDJ
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Looks like a technical drawing board: small squares forming a nice grid.
Source We Are Pixel8