Micro Carbon #7
 Carbon  CC BY-SA 3.0

Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.

Source Atle Mo

 More Textures
Rustymetal Lambertian #1646
 Metal  CC 0

Metal-Rusty & Rustymetal. CC0 License.

Source Unknow

Redox 01 #849
 Light  CC BY-SA 3.0

Bright gray tones with a hint of some metal surface.

Source Hendrik Lammers

Wood Chips 1 #2099
 Unknow  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Metal Background Pattern With Rivets #1085
 Metal  CC BY-SA 3.0

This metal background pattern resembles a metal plate with rivets. Solid rivets on a metal plate.

Source V. Hartikainen

Seamless Paper Texture (Pale Yellow) #1217
 Yellow  CC BY-SA 3.0

A seamless paper background texture colored in pale yellow. This seamless texture is ideal for those who need a yellow background image for their website. The texture resembles paper.

Source V. Hartikainen

Floors & Block #1601
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Concretia 5 #1412
 Gray  CC 0

Gamedev - Concrete Textures. CC0 License.

Source Davit Masia

Prismatic Abstract Line Art Pattern [email protected] #566
 Dark  CC 0

Prismatic Abstract Line Art Pattern Background

Source GDJ

Summer leaves pattern #2469
 Green  CC 0

A seamless pattern formed from leaves.

Source Firkin

crissXcross #111
 Dark  CC BY-SA 3.0

Dark pattern with some nice diagonal stitched lines crossing over.

Source Ashton

Thick Textured Brown Paper #1070
 Paper  CC BY-SA 3.0

A repeating background of thick textured paper. Actually, it turned out to look like something between a paper and fabric.

Source V. Hartikainen

Seamless 3D Isometric Tessellation Pattern 2 #147
 Light  CC 0

A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).

Source GDJ

Floors & Yellow #1606
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

ed62's pattern remixed #1728
 Dark  CC 0

The original has been presented as black on transparent and stored in the pattern definitions. To retrieve the unit tile select the rectangle in Inkscape and use shift+alt+i

Source Firkin

Decorative divider 228 #2154
 Dark  CC 0

Remixed 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

Cross Scratches #625
 Paper  CC BY-SA 3.0

Subtle scratches on a light gray background.

Source Andrey Ovcharov

Decorative divider 250 #2070
 Dark  CC 0

Remixed from a drawing in 'Очерки Русской Исторіи въ памятникахъ быта', Petr Polevoi, 1879.

Source Firkin

Paper yellowish 2 #2119
 Paper  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Rough Diagonal #691
 Fabric  CC BY-SA 3.0

The classic 45-degree diagonal line pattern, done right.

Source Jorick van Hees

Background pattern 294 #1921
 Dark  CC 0

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

Source Firkin

Dark Metallic Background Pattern #1088
 Metal  CC BY-SA 3.0

A dark background pattern/texture of a dimpled metal plate.

Source V. Hartikainen

Parket #1478
 Wood  CC 0

Parket & Wood CC0 texture.

Source Unknow

Prismatic Isometric Cube Wireframe Pattern No Background #499
 Light  CC 0

Prismatic Isometric Cube Wireframe Pattern No Background

Source GDJ

Background pattern 223 #2353
 Red  CC 0

Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.

Source Firkin

Stone Wall & Yellow #1497
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 274 #2041
 Dark  CC 0

Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.

Source Firkin

Floors & Black #1610
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Hoffman #1152
 Wall  CC BY-SA 3.0

Did anyone say The Hoff? This pattern is in no way related to Baywatch.

Source Josh Green

Background pattern purple #1952
 Colorful  CC 0

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

Source Firkin