Dark Sharp Edges #1320
 Dark  CC BY-SA 3.0

Some dark 45 degree angles creating a nice pattern. Huge.

Source Dark Sharp Edges

 More Textures
Noisy #45
 Paper  CC BY-SA 3.0

Looks a bit like concrete with subtle specks spread around the pattern.

Source Mladjan Antic

Planks & Wornboards #1350
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

Floors & Dark Wood #1615
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Background pattern 309 (colour 2) #1865
 Blue  CC 0

Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.

Source Firkin

Stone Wall & Yellow #1551
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Decorative divider 231 #2149
 Dark  CC 0

From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.

Source Firkin

Blue #1264
 Paper  CC 0

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

Source Sojan Janso

Leafy frame 32 #1714
 Dark  CC 0

Derived from an image that was uploaded to Pixabay by Darkmoon1968

Source Firkin

Prismatic Curved Diamond Pattern 2 No [email protected] #539
 Diamond  CC 0

Prismatic Curved Diamond Pattern 2 No Background

Source GDJ

Wavy background #2018
 Colorful  CC 0

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

Source SliverKnight

Concretia 7 #1414
 Gray  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia

Leafy pattern 12 (colour) #1762
 Red  CC 0

From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.

Source Firkin

Office #957
 Dark  CC BY-SA 3.0

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

Source Andrés Rigo.

Decorative divider 289 #1819
 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

Decorative divider 216 #2243
 Dark  CC 0

Remixed from a raster on Pixabay that was uploaded by ArtsyBee.

Source Firkin

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

Squares #302
 Dark  CC BY-SA 3.0

Dark, square, clean and tidy. What more can you ask for?

Source Jaromír Kavan

Background patter 294  #1920
 Dark  CC 0

Remixed from a drawing in 'Works. Popular edition', John Ruskin, 1886.

Source Firkin

Fabric pattern 2 (colour 2) #2395
 Fabric  CC 0

Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Background pattern 250 #2172
 Dark  CC 0

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

Source Firkin

Asfault 6 #1385
 Dark  CC 0

Gamedev - Asphalt textures. CC0 License.

Source Davit Masia

Tessellation 16 (colour 6) #2210
 Colorful  CC 0

The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i

Source Firkin

P5 #1113
 Light  CC BY-SA 3.0

Number five from the same submitter, makes my job easy.

Source Dima Shiper

Aged Grid Paper Background #1072
 Paper  CC BY-SA 3.0

A seamless web background with texture of aged grid paper.

Source V. Hartikainen

Black [email protected] #56
 Dark  CC BY-SA 3.0

Black paper texture, based on two different images.

Source Atle Mo
Based from Kindle

Dark [email protected] #130
 Dark  CC BY-SA 3.0

You were craving more leather, so I whipped this up by scanning a leather jacket.

Source Atle Mo

Lined [email protected] #363
 Stripes  CC BY-SA 3.0

The classic notebook paper with horizontal stripes.

Source Are Sundnes

Feathered #1324
 Unknow  CC BY-SA 3.0

This is sort of fresh, but still feels a bit old school.

Source Martuchox