"Light Green Wall", Repeatable Texture #1190
 Concrete  CC BY-SA 3.0

Here's a repeatable texture that resembles a light green concrete wall or something similar.

Source V. Hartikainen

 More Textures
Knitted Sweater #1097
 Light  CC BY-SA 3.0

Can never have too many knitting patterns, especially as nice as this.

Source Victoria Spahn

Background pattern 242 #2203
 Red  CC 0

Random colour tile.

Source Firkin

[email protected] #1151
 Dark  CC BY-SA 3.0

Tweed is back in style – you heard it here first. Also, the @2X version here is great!

Source Simon Leo

Stone Wall & Purple #1541
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Stone Wall & Red #1576
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Rice Wall #1255
 Wall  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Floral background 21 (colour) #1784
 Dark  CC 0

From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.

Source Firkin

Metal Pole Rusty & Light #1650
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Clover with background #237
 Paper  CC 0

Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.

Source BAJ

Project Papper #119
 Paper  CC BY-SA 3.0

Light square grid pattern, great for a “DIY projects” sort of website, maybe?

Source Rafael Almeida

Wood 9 #1454
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Use Your [email protected] #918
 Dark  CC BY-SA 3.0

A dark one with geometric shapes and dotted lines.

Source Mohawk Studios

Subtle Freckles #89
 Light  CC BY-SA 3.0

This is so subtle: We’re talking 1% opacity. Get your squint on!

Source Atle Mo

Wall #1362
 Wall  CC 0

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

Source Linolafett

Lego background #266
 Noise  CC 0

Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.

Source Firkin

Decorative divider 234 #2093
 Dark  CC 0

Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.

Source Firkin

Wavy background #2012
 Green  CC 0

A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic

Source Firkin

Abstract Arbitrary Geometric Background #497
 Noise  CC 0

Abstract Arbitrary Geometric Background derived from an image on Pixabay.

Source GDJ

Noisy Net #976
 Dark  CC BY-SA 3.0

Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.

Source Tom McArdle

Eight Horns #1325
 Light  CC BY-SA 3.0

Looks like an old rug or a computer chip.

Source Patutin Sergey

Prismatic Hypnotic Pattern No Background #571
 Noise  CC 0

Prismatic Hypnotic Pattern No Background

Source GDJ

overlay crack #153
 Noise  CC 0

This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.

Source Lazur URH

[email protected] #660
 Fabric  CC BY-SA 3.0

Farmer could be some sort of fabric pattern, with a hint of green.

Source Fabian Schultz

Fabric pattern 2 (colour 4) #2393
 Fabric  CC 0

Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Leafy pattern 11 #1765
 Dark  CC 0

From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.

Source Firkin

Repeating Stone-Like Background (Dark Brown) #1056
 Stone  CC BY-SA 3.0

A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.

Source V. Hartikainen