Stone Wall & Yellow #1553
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

 More Textures
Smooth Wall #27
 Light  CC BY-SA 3.0

Some rectangles, a bit of dust and grunge, plus a hint of concrete.

Source Atle Mo

Block Well #1696
 Colorful  CC 0

Background Wall, Art Abstract, Block Well & CC0 texture.

Source Ractapopulous

Soft Circle [email protected] #114
 Light  CC BY-SA 3.0

Japanese looking fish scale pattern.

Source Ian Soper

Background pattern 225 (colour 6) #2322
 Brown  CC 0

Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

[email protected] #134
 Light  CC BY-SA 3.0

This reminds me of Game Cube. A nice light 3D cube pattern.

Source Sander Ottens

Chain background #2063
 Dark  CC 0

Remixed from a drawing in 'Canadian forest industries July-December', 1915

Source Firkin

Concretia 1 #1408
 Gray  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia

Grunge For Surfaces 8 #1405
 Dark  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Wine [email protected] #34
 Light  CC BY-SA 3.0

Wine cork texture based off a scanned corkboard.

Source Atle Mo

Pine Bark #1276
 Wall  CC 0

Zero CC tileable pine bark texture, photographed and made by me. CC0

Source Sojan Janso

Decorative divider 280 #1875
 Blue  CC 0

From a drawing in 'Artists and Arabs', Henry Blackburn, 1868

Source Firkin

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

Background pattern 251 (colour 3) #2165
 Blue  CC 0

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

Source Firkin

Planks & Roughcedar #1353
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

Psychedelic Geometric Background No [email protected] #812
 Noise  CC 0

Psychedelic Geometric Background No Black

Source GDJ

Square frame 3 #2354
 Dark  CC 0

Formed in Paint.net and vectorised in Vector Magic.

Source Firkin

Prismatic Groovy Concentric Background 5 No [email protected] #468
 Dark  CC 0

Prismatic Groovy Concentric Background 5 No Black

Source GDJ

Green & Grass #1368
 Green  CC 0

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

Source Linolafett

Background pattern 336 #1721
 Pink  CC 0

Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.

Source Firkin

Prismatic Groovy Concentric Background 5 #465
 Dark  CC 0

Prismatic Groovy Concentric Background 5

Source GDJ

Background pattern 312 (colour 2) #1859
 Red  CC 0

Alternative colour scheme

Source Firkin

[email protected] #716
 Light  CC BY-SA 3.0

One more in the line of patterns inspired by Japanese/Asian styles. Smooth.

Source Kim Ruddock

Low Contrast Linen #863
 Dark  CC BY-SA 3.0

A smooth mid-tone gray, or low contrast if you will, linen pattern.

Source Jordan Pittman

Background pattern 226 #2321
 Brown  CC 0

A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

White Brick Wall #593
 Wall  CC BY-SA 3.0

If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.

Source Listvetra

Embossed [email protected] #732
 Paper  CC BY-SA 3.0

One more from Badhon, sharp horizontal lines making an embossed paper feeling.

Source Badhon Ebrahim