Solid #845
 Gray  CC BY-SA 3.0

A mid-tone gray pattern with some cement looking texture.

Source Hendrik Lammers

 More Textures
Redox 01 #849
 Light  CC BY-SA 3.0

Bright gray tones with a hint of some metal surface.

Source Hendrik Lammers

Light Striped Background #937
 Stripes  CC BY-SA 3.0

A light background pattern with diagonal stripes. Here's a simple light striped background for you.

Source V. Hartikainen

Background pattern purple #1998
 Colorful  CC 0

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

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

White [email protected] #772
 Wall  CC BY-SA 3.0

A huge one at 800x600px. Made from a photo I took going home after work.

Source Atle Mo

Stone Wall & Dark #1545
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

White Wave #681
 Stripes  CC BY-SA 3.0

Light and tiny, just the way you like it.

Source Rohit Arun Rao

[email protected] #325
 Grid  CC BY-SA 3.0

Sometimes simple really is what you need, and this could fit you well.

Source Factorio.us Collective

Stone Wall & Yellow #1518
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Prismatic Curved Diamond Pattern 2 No Background #538
 Diamond  CC 0

Prismatic Curved Diamond Pattern 2 No Background

Source GDJ

Background pattern 8 (greyscale) #210
 Dark  CC 0

Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net

Source Firkin

flower seamless pattern #2272
 Brown  CC 0

This is a seamless pattern which is derived from a flower petal image.

Source Yamachem

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

Fence 9 (colour 2) #2194
 Wood  CC 0

A browner version of the original weathered fence texture.

Source Firkin

White [email protected] #12
 Carbon  CC BY-SA 3.0

Same as the black version, but now in shades of gray. Very subtle and fine grained.

Source Atle Mo

Background pattern brown #1951
 Brown  CC 0

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

Source Firkin

Stone Wall & Yellow #1578
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Classy Fabric #611
 Dark  CC BY-SA 3.0

This is lovely, just the right amount of subtle noise, lines and textures.

Source Richard Tabor

Clean [email protected] #738
 Fabric  CC BY-SA 3.0

A nice light textile pattern for your kit.

Source N8rx

White Well & Fissure #1701
 Wall  CC 0

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

Source Ractapopulous

Paper 2 #21
 Paper  CC BY-SA 3.0

New paper pattern with a slightly organic feel to it, using some thin threads.

Source Atle Mo

Decorative divider 253 #2064
 Dark  CC 0

From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.

Source Firkin

Stone Wall & Yellow #1555
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 104 #561
 Dark  CC 0

Background pattern 104

Source Firkin

Cincinnati tablet 2 #2146
 Dark  CC 0

Remixed from a drawing in 'Prehistoric Man: researches into the origin of civilisation in the old and the new world', Daniel Wilson, 1876.

Source Firkin

[email protected] #664
 Paper  CC BY-SA 3.0

This is so subtle I hope you can see it! Tweak at will.

Source Alexandre Naud

Visual illusion #2586
 Grid  CC 0

The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Subtle Carbon #949
 Dark  CC BY-SA 3.0

There are many carbon patterns, but this one is tiny.

Source Designova

[email protected] #954
 Dark  CC BY-SA 3.0

Hexagonal dark 3D pattern. What more can you ask for?

Source Norbert Levajsics