Wide Rectangles #699
 Wall  CC BY-SA 3.0

Simple wide squares with a small indent. Fits all.

Source Petr Šulc.

 More Textures
Seamless Texture of Wood Planks #880
 Wood  CC BY-SA 3.0

Here's an yet another background for websites, with a seamless texture of wood planks this time.

Source V. Hartikainen

Blu Stripes #617
 Fabric  CC BY-SA 3.0

Very simple, very blu(e). Subtle and nice.

Source Seb Jachec

Double [email protected] #52
 Stripes  CC BY-SA 3.0

Horizontal and vertical lines on a light gray background.

Source Adam Anlauf

Prismatic Polka Dots Mark II 2 No [email protected] #533
 Noise  CC 0

Prismatic Polka Dots Mark II 2 No Background

Source GDJ

Paper Fibers #1060
 Paper  CC BY-SA 3.0

Just what the name says, paper fibers. Always good to have.

Source Heliodor jalba

"Gold Buttons", Pale Yellow BG Pattern #1215
 Yellow  CC BY-SA 3.0

This yellow background consists of a pattern of glossy gold buttons arranged in polka dot style on a seamless texture. Here's a pale yellow background pattern. Feel free to use it for your needs!

Source V. Hartikainen

Bamboo Background Pattern #1330
 Green  CC BY-SA 3.0

This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).

Source V. Hartikainen

Stylized lion design #2089
 Dark  CC 0

Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.

Source Firkin

Whitey #109
 Light  CC BY-SA 3.0

A white version of the very popular linen pattern.

Source Ant Ekşiler

Stone Wall & Gray #1513
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Square ornament 37 (colour) #2176
 Colorful  CC 0

Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.

Source Firkin

Diagonales Decalé[email protected] #1019
 Light  CC BY-SA 3.0

Sounds French. Some 3D square diagonals, that’s all you need to know.

Source Graphiste

White Texture #131
 Light  CC BY-SA 3.0

Not the most creative name, but it’s a good all-purpose light background.

Source Dmitry

Elegant Grid #316
 Wall  CC BY-SA 3.0

This is a hot one. Small, sharp and unique.

Source GraphicsWall

Background Patterns - Bronze #246
 Fabric  CC 0

If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117

Source Viscious-Speed

Light Orange Brown Wallpaper #911
 Stripes  CC BY-SA 3.0

A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.

Source V. Hartikainen

Burried #831
 Dark  CC BY-SA 3.0

Have you wondered about how it feels to be buried alive? Here is the pattern for it.

Source Hendrik Lammers

Decorative divider 277 #1906
 Colorful  CC 0

Vector version of a png that was uploaded to Pixabay by pencilparker

Source Firkin

Robots #125
 Dark  CC BY-SA 3.0

And some more testing, this time with Seamless Studio. It’s Robots FFS!

Source Seamless Studio

Background pattern 215 (colour 4) #2368
 Green  CC 0

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

Source Firkin

Stone Wall & Green #1533
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Rustymetal Glossy #1647
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Background pattern 18 #202
 Dark  CC 0

A seamless pattern the starting point for which was a 'colour modulo' texture in Paint.net.

Source Firkin

Wall #1248
 Wall  CC 0

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

Source Sojan Janso

"Black Groove Stripes", Repeating Background #971
 Stripes  CC BY-SA 3.0

A repeating background for websites with a texture of black groove stripes.

Source V. Hartikainen

Ecailles #1042
 Light  CC BY-SA 3.0

Almost like little fish shells, or dragon skin.

Source Graphiste

Vintage pattern 2 #2295
 Yellow  CC 0

Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

White Wall 3 #1148
 Wall  CC BY-SA 3.0

This one needs to be used in small areas; you can see it repeat.

Source Luca

[email protected] #668
 Dark  CC BY-SA 3.0

Your eyes can trip a bit from looking at this – use it wisely.

Source Michal Chovanec