Checkered Light [email protected] #281
 Grid  CC BY-SA 3.0

Sort of like the Photoshop transparent background, but better!

Source Alex Parker

 More Textures
Exclusive Paper #23
 Light  CC BY-SA 3.0

Paper pattern with small dust particles and 45-degree strokes.

Source Atle Mo

[email protected] #958
 Dark  CC BY-SA 3.0

I guess this one is inspired by an office. A dark office.

Source Andrés Rigo.

Lego background #2428
 Colorful  CC 0

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

Source Firkin

Gray [email protected] #914
 Light  CC BY-SA 3.0

Some more diagonal lines and noise, because you know you want it.

Source Atle Mo

Wall #1360
 Wall  CC 0

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

Source Linolafett

Background pattern 41 #262
 Fabric  CC 0

A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.

Source Firkin

Sponge A2-4 #2127
 Wall  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Diamond [email protected] #686
 Diamond  CC BY-SA 3.0

Everyone loves a diamond, right? Make your site sparkle.

Source AJ Troxell

Billie [email protected] #1003
 Light  CC BY-SA 3.0

No relation to the band, but damn it’s subtle!

Source Thomas Myrman

Gun Metal #360
 Dark  CC BY-SA 3.0

With a name this awesome, how can I go wrong?

Source Nikolay Boltachev

Film strip #1901
 Dark  CC 0

8 frame film strip with the pictures left blank

Source SliverKnight

Blu Stripes #617
 Fabric  CC BY-SA 3.0

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

Source Seb Jachec

Striped Fabric Pattern #998
 Stripes  CC BY-SA 3.0

A light gray background pattern with seamless fabric-like texture and almost unnoticeable stripes.

Source V. Hartikainen

leaf seamless pattern #2262
 Blue  CC 0

The image depicts a tiled seamless pattern.The tile represents four leaves aligned every 90 ° , which may look like a bird or a dragon .The original leaf design is from a Japanese old book.

Source Yamachem

Crisp Paper [email protected] #842
 Light  CC BY-SA 3.0

Sort of reminds me of those old house wallpapers.

Source Tish

Dark [email protected] #122
 Dark  CC BY-SA 3.0

Small dots with minor circles spread across to form a nice mosaic.

Source John Burks

Background pattern 310 #1862
 Red  CC 0

Based on an image that was uploaded to Pixabay by devanath

Source Firkin

Fabric 1 #9
 Light  CC BY-SA 3.0

Semi-light fabric pattern made out of random pixels in shades of gray.

Source Atle Mo

Stone Wall & Red #1576
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 226 (colour 2) #2320
 Green  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

Prismatic Snowflakes Pattern 2 No Background #412
 Light  CC 0

Prismatic Snowflakes Pattern 2 No Background

Source GDJ

Tree Bark #1182
 Light  CC BY-SA 3.0

This one is something special. I’d call it a flat pattern, too. Very well done, sir!

Source GetDiscount

Background pattern pink #1954
 Pink  CC 0

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

Source Firkin

Old Mathematics #43
 Stripes  CC BY-SA 3.0

This one takes you back to math class. Classic mathematic board underlay.

Source Josh Green

Floral pattern 17 #1723
 Dark  CC 0

Derived from an image that was uploaded to Pixabay by mdmelo.

Source Firkin

Floral background 2 #380
 Wall  CC 0

Background formed from the original with an emboss effect

Source GDJ

Light Wool #695
 Grid  CC BY-SA 3.0

Submitted as a black pattern, I made it light and a few steps more subtle.

Source Andy