Boiler Plate Rust & Red #1662
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

 More Textures
Cherry pattern #1912
 Unknow  CC 0

Used a cherry by doctormo to make this seamless pattern

Source Firkin

Dark Denim #372
 Dark  CC BY-SA 3.0

Thin lines, noise and texture creates this crisp dark denim pattern.

Source Marco Slooten

Prismatic Abstract Background Design #403
 Noise  CC 0

Prismatic Abstract Background Design

Source GDJ

Tile-able Black Paper Background #1076
 Paper  CC BY-SA 3.0

A black tile-able background with paper-like texture.

Source V. Hartikainen

Cartographer #749
 Dark  CC BY-SA 3.0

A topographic map like this has actually been requested a few times, so here you go!

Source Sam Feyaerts

Diamond pattern (colour 8) #2273
 Red  CC 0

From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

[email protected] #50
 Wood  CC BY-SA 3.0

Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com

Source Atle Mo

Background pattern purple #1946
 Colorful  CC 0

To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Leafy pattern 7 (colour 3) #1825
 Green  CC 0

Alternative colour scheme.

Source Firkin

Simple Horizontal Light #982
 Light  CC BY-SA 3.0

Sometimes you just need the simplest thing.

Source Fabricio

Floors & Block #1604
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Prismatic Dots Background 7 #513
 Dark  CC 0

Prismatic Dots Background 7

Source GDJ

Background pattern 215 (colour 2) #2370
 Blue  CC 0

A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.

Source Firkin

Background pattern 313 #1858
 Dark  CC 0

Background pattern originally a PNG drawn in Paint.net

Source Firkin

Prismatic Abstract Line Art Pattern Background 2 #567
 Dark  CC 0

Prismatic Abstract Line Art Pattern Background 2

Source GDJ

Rough Concrete Surface #1195
 Concrete  CC BY-SA 3.0

This one resembles a black concrete wall when is tiled. It should look great, at least with dark website themes.

Source V. Hartikainen

Decorative divider 281 #1874
 Wall  CC 0

Remixed from a drawing that was uploaded to Pixabay by ractapopulous

Source Firkin

Repeating Vintage Paper Background #1077
 Paper  CC BY-SA 3.0

A repeating background of beige paper with vintage look. Repeats to infinity, as usual.

Source V. Hartikainen

Cover Cells Book #1277
 Red  CC 0

Zero CC tileable hard cover cells book texture, 4k, scanned and made by me. CC0

Source Sojan Janso

Abstract Tiled Background Extended 7 #518
 Dark  CC 0

Abstract Tiled Background Extended 7

Source GDJ

Dark Tire #703
 Dark  CC BY-SA 3.0

Dark, crisp and subtle. Tiny black lines on top of some noise.

Source Wilmotte Bastien

Paper Blank 1 #2115
 Paper  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Diamond Metal Plate #1397
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Cardboard [email protected] #962
 Gray  CC BY-SA 3.0

Not a flat you live inside, like in the UK – but a flat piece of cardboard.

Source Appleshadow

Brick #1377
 Wall  CC 0

Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!

Source Linolafett

Egg [email protected] #862
 Light  CC BY-SA 3.0

It’s an egg, in the form of a pattern. This really is 2012.

Source Paul Phönixweiß

Prismatic Rounded Squares Grid 4 No Background #491
 Noise  CC 0

Prismatic Rounded Squares Grid 4 No Background

Source GDJ

Vintage pattern #1957
 Grid  CC 0

Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.

Source Firkin

Pattern #1476
 Paper  CC 0

Pattern Background, Texture, Photoshop Structure style CC0 texture.

Source Darkmoon1968