Stone Wall & Light #1550
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

 More Textures
Symphony #1339
 Light  CC BY-SA 3.0

Enjoy this like classical music.

Source iliad

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

Background pattern 112 #263
 Fabric  CC 0

A seamless pattern with a unit cell drawn as a bitmap in Paint.net and vectorized in Vector Magic.

Source Firkin

Retro Squares Background 8 #398
 Noise  CC 0

Retro Squares Background 8

Source GDJ

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

Concrete Wall 2 #79
 Wall  CC BY-SA 3.0

A light gray wall or floor (you decide) of concrete.

Source Atle Mo

Always [email protected] #54
 Dark  CC BY-SA 3.0

Crossing lines with a subtle emboss effect on a dark background.

Source Stefan Aleksić

[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

Floors #1589
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Inspiration [email protected] #1176
 Unknow  CC BY-SA 3.0

This one is rather fun and playful. The 2X could be used at 1X too!

Source Welsley

meshed silhouette-omnibus #2484
 Brown  CC 0

The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.

Source Yamachem

Tex2res2 #719
 Fabric  CC BY-SA 3.0

Number 2 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.

Source Janos Koos

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

Stone Wall & Yellow #1551
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Colorful Floral Background [email protected] #484
 Dark  CC 0

Colorful Floral Background 3

Source GDJ

ecorative divider 209 #2365
 Dark  CC 0

Derived from elements found in a floral ornament drawing on Pixabay.

Source Firkin

Background pattern 234 (colour 4) #2256
 Pink  CC 0

Drawn in Paint.net and vectorised in Vector Magic.

Source Firkin

Tex2res1 #721
 Fabric  CC BY-SA 3.0

Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.

Source Janos Koos

Background pattern 315 (colour 5) #1841
 Yellow  CC 0

The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i

Source Firkin

Always Grey #53
 Dark  CC BY-SA 3.0

Crossing lines with a subtle emboss effect on a dark background.

Source Stefan Aleksić

[email protected] #357
 Light  CC BY-SA 3.0

It’s a hole, in a pattern. On your website. Dig it!

Source Josh Green

Decorative divider #1974
 Dark  CC 0

Adapted from a drawing in 'Line and form', Walter Crane, 1914.

Source Firkin

Abstract tulip (wood) #1892
 Wood  CC 0

The original tulip given a wooden texture.

Source Firkin

Wavy background #2022
 Blue  CC 0

CC0 and a seamless pattern from a tile drawn in Paint.net .

Source SliverKnight

Stone Wall & Gray #1562
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 105 #563
 Dark  CC 0

A seamless pattern formed from background pattern 102

Source Firkin

Floors & Block #1598
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Prismatic Curved Diamond Pattern 5 No Background #543
 Diamond  CC 0

Prismatic Curved Diamond Pattern 5 No Background

Source GDJ

stone filter pack #154
 Stone  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

"Dark Brick Wall", Background Pattern #1024
 Stone  CC BY-SA 3.0

Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.

Source V. Hartikainen