Gradient [email protected] #694
 Grid  CC BY-SA 3.0

It’s big, it’s gradient—and it’s square.

Source Brankic1979

 More Textures
Wood 5 #1448
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Wall #1244
 Wall  CC 0

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

Source Sojan Janso

Paper [email protected] #16
 Paper  CC BY-SA 3.0

A slightly grainy paper pattern with small horizontal and vertical strokes.

Source Atle Mo

Decorative divider 204 #2388
 Dark  CC 0

Adapted from a jpg on Pixabay.

Source Firkin

Paper 2 #2113
 Paper  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Background pattern 277 (colour) #2031
 Orange  CC 0

A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.

Source Firkin

Hearts pattern #1822
 Pink  CC 0

A seamless pattern with a heart theme.

Source Firkin

Square Flower #1691
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Retro Circles Background 4 #420
 Dark  CC 0

Retro Circles Background 4

Source GDJ

Stone Wall & Yellow #1573
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Stone Wall & Dark #1548
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Colourful background #2009
 Colorful  CC 0

Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic

Source Firkin

Ribbon pattern 2 (version 2, colour 2) #2038
 Colorful  CC 0

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

Source Firkin

"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

Stone Wall & Dark #1496
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Fleur #1675
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Multiple Greek key frame #1733
 Dark  CC 0

Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.

Source Firkin

Diagonal [email protected] #1007
 Gray  CC BY-SA 3.0

It has waves, so make sure you don’t get sea sickness.

Source CoolPatterns

Part of Bayeux Tapestry 2 #2451
 Noise  CC 0

From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.

Source Firkin

Light Grey Floral [email protected] #345
 Wall  CC BY-SA 3.0

Lovely light gray floral motif with some subtle shades.

Source GraphicsWall

Nice Snow #1199
 Light  CC BY-SA 3.0

Not the most subtle, but very useful.

Source Kerstkaarten

Prismatic Triangular Background Design Mark II 5 #406
 Dark  CC 0

Prismatic Triangular Background Design Mark II 5

Source GDJ

White [email protected] #1106
 Wall  CC BY-SA 3.0

Looks like an old wall. I guess that’s it then?

Source Viahorizon

Dark Geometric #619
 Dark  CC BY-SA 3.0

Continuing the geometric trend, here is one more.

Source Mike Warner

Flower [email protected] #742
 Noise  CC BY-SA 3.0

Sharp pixel pattern, just like the good old days.

Source Paridhi

White carbon #11
 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

Prismatic Triangular Background Design Mark II [email protected] #788
 Dark  CC 0

Prismatic Triangular Background Design Mark II 5

Source GDJ

Diamond pattern 2 (colour 5) #2264
 Blue  CC 0

From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Octagonal frame 2 #2356
 Dark  CC 0

Formed in Paint.net and vectorised in Vector Magic.

Source Firkin