Metal Pole Rusty & Light #1650
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

 More Textures
Background pattern 336 (colour 3) #1719
 Blue  CC 0

Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.

Source Firkin

Colorful Floral [email protected] #480
 Noise  CC 0

Colorful Floral Background

Source GDJ

Prismatic Groovy Concentric Background 3 #457
 Noise  CC 0

Prismatic Groovy Concentric Background 3

Source GDJ

Wavy background #2020
 Green  CC 0

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

Source SliverKnight

Floral background 22 #1780
 Dark  CC 0

From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.

Source Firkin

Decorative divider 215 #2242
 Dark  CC 0

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

Source Firkin

“Transparent” Background [email protected] #494
 Light  CC 0

An emulated “transparent” background pattern, like that of all kinds of computer graphics software.

Source AdamStanislav

Background pattern 269 #2062
 Dark  CC 0

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

Source Firkin

Prismatic Curved Diamond Pattern No Background #536
 Diamond  CC 0

Prismatic Curved Diamond Pattern No Background

Source GDJ

Pinstripe #35
 Light  CC BY-SA 3.0

Light gray pattern with a thin pinstripe.

Source Brandon

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

Textured [email protected] #868
 Stripes  CC BY-SA 3.0

A lovely light gray pattern with stripes and a dash of noise.

Source V. Hartikainen

Paper 1 #15
 Paper  CC BY-SA 3.0

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

Source Atle Mo

Christmas pattern (colour) #2423
 Fabric  CC 0

Derived from an image on Pixabay.

Source Firkin

Background pattern 203 #2486
 Brown  CC 0

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

Source Firkin

Brushed Aluminum #1388
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Prismatic Polka Dots Mark II 2 No Background #532
 Noise  CC 0

Prismatic Polka Dots Mark II 2 No Background

Source GDJ

Cross Stripes #47
 Dark  CC BY-SA 3.0

Nice and simple crossed lines in dark gray tones.

Source Stefan Aleksić

Mix & Gray Pattern #1631
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

"Black Groove Stripes", Repeating Background #971
 Stripes  CC BY-SA 3.0

A repeating background for websites with a texture of black groove stripes.

Source V. Hartikainen

Triangular Psychosis 2 #234
 Noise  CC 0

A colorful triangular background, variation 2.

Source GDJ

Abstract Stars Geometric Pattern Prismatic No Background #384
 Noise  CC 0

Abstract Stars Geometric Pattern Prismatic No Background

Source GDJ

Prismatic Curved Diamond Pattern 3 No Background #162
 Diamond  CC 0

Prismatic Curved Diamond Pattern 3 No Background

Source GDJ

Light Paper [email protected] #836
 Paper  CC BY-SA 3.0

More in the paper realm, this time with fibers.

Source Jorge Fuentes

Squairy #1138
 Light  CC BY-SA 3.0

Super tiny dots and all sorts of great stuff.

Source Newbury

[email protected] #128
 Dark  CC BY-SA 3.0

Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.

Source Ivan Ginev

Abstract Tiled Background Extended 7 #518
 Dark  CC 0

Abstract Tiled Background Extended 7

Source GDJ

"Green Rhombuses", Seamless Background Pattern #1336
 Green  CC BY-SA 3.0

A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.

Source V. Hartikainen

Concrete Wall [email protected] #80
 Wall  CC BY-SA 3.0

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

Source Atle Mo

Dark Tile-able Grunge Texture #1123
 Grunge  CC BY-SA 3.0

Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.

Source V. Hartikainen