White Wall #771
 Wall  CC BY-SA 3.0

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

Source Atle Mo

 More Textures
Floral design 91 #1814
 Dark  CC 0

From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.

Source Firkin

Dimension #1173
 Light  CC BY-SA 3.0

Don’t look at this one too long if you’re high on something.

Source Luuk van Baars

Triangles pattern #2408
 Brown  CC 0

A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Brushed Alum Dark #65
 Dark  CC BY-SA 3.0

Because I love dark patterns, here is Brushed Alum in a dark coating.

Source Tim Ward

"Maple", Seamless Wood Texture #883
 Wood  CC BY-SA 3.0

Here I have tried to create something that would look like maple wood. Not sure how well it's turned out, but at least it looks like wood.

Source V. Hartikainen

Leafy pattern 14 #1717
 Dark  CC 0

Derived from an image on Pixabay from Merio

Source Firkin

Colourful background #2010
 Colorful  CC 0

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

Source Firkin

Sprinkles #1185
 Unknow  CC BY-SA 3.0

Add some sprinkles to your site.

Source Rebecca Litt

Craft Paper #1279
 Yellow  CC 0

Zero CC tileable yellow craft paper; scanned and made by me. CC0

Source Sojan Janso

Vintage Clay Tile 1 #1458
 Unknow  CC 0

Gamedev - Roofs Textures. CC0 License.

Source Davit Masia

Background pattern 253 #2153
 Brown  CC 0

A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.

Source Firkin

Patterned Pale Orange Background #1314
 Orange  CC BY-SA 3.0

You may use it as is, or modify it as you like.

Source V. Hartikainen

Stone Wall & Yellow #1573
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Stone Wall & Yellow #1517
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Paper [email protected] #32
 Paper  CC BY-SA 3.0

Light gray paper pattern with small traces of fiber and some dust.

Source Atle Mo

Grilled [email protected] #582
 Fabric  CC BY-SA 3.0

You could get a bit dizzy from this one, but it might come in handy.

Source Dertig Media

Background pattern 302 #1894
 Red  CC 0

The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.

Source Firkin

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

Planks & Wornboards #1350
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

Dark [email protected] #818
 Dark  CC BY-SA 3.0

Just to prove my point, here is a slightly modified dark version.

Source Atle Mo

samekomon-02 #2263
 Pink  CC 0

The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.

Source Yamachem

Background pattern 248 #2181
 Dark  CC 0

To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Cheap Diagonal Fabric #1345
 Gray  CC BY-SA 3.0

Fabric is never out of style.

Source Ufuk Sarp Selçok

Prismatic Groovy Concentric Background 5 No Black #467
 Dark  CC 0

Prismatic Groovy Concentric Background 5 No Black

Source GDJ

Prismatic Groovy Concentric Background [email protected] #458
 Noise  CC 0

Prismatic Groovy Concentric Background 3

Source GDJ

Concretia 6 #1413
 Gray  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia