Brushed Alum [email protected] #66
 Dark  CC BY-SA 3.0

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

Source Tim Ward

 More Textures
Subtle Grunge #1040
 Light  CC BY-SA 3.0

A heavy hitter at 400x400px, but lovely still.

Source Breezi

Exclusive [email protected] #24
 Light  CC BY-SA 3.0

Paper pattern with small dust particles and 45-degree strokes.

Source Atle Mo

Prismatic Pointers Background #388
 Noise  CC 0

Prismatic Pointers Background

Source GDJ

Circular frame 26 #1711
 Dark  CC 0

Derived from an image that was uploaded to Pixabay by Darkmoon1968

Source Firkin

Dark Concrete Wall #1193
 Concrete  CC BY-SA 3.0

A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.

Source V. Hartikainen

Concrete Wall 3 #93
 Light  CC BY-SA 3.0

All good things come in threes, so I give you the third in my little concrete wall series.

Source Atle Mo

Stone Wall & Dark #1582
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 214 (colour 4) #2373
 Yellow  CC 0

A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.

Source Firkin

Prismatic Isometric Cube Wireframe Pattern No [email protected] #500
 Light  CC 0

Prismatic Isometric Cube Wireframe Pattern No Background

Source GDJ

Congruent Pentagon Outline #1308
 Dark  CC BY-SA 3.0

By popular request, an outline version of the pentagon pattern.

Source Atle Mo

[email protected] #776
 Grid  CC BY-SA 3.0

Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.

Source Wassim

Floral design 94 #1792
 Yellow  CC 0

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

Source Firkin

Psychedelic #745
 Gray  CC BY-SA 3.0

Geometric triangles seem to be quite hot these days.

Source Pixeden

Background pattern 339 (colour) #1708
 Yellow  CC 0

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

Source Firkin

Dungeons & Flagons 7 #1423
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Stone Wall & Yellow #1572
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Low Contrast [email protected] #864
 Dark  CC BY-SA 3.0

A smooth mid-tone gray, or low contrast if you will, linen pattern.

Source Jordan Pittman

Stamped Dots On Metal #1083
 Metal  CC BY-SA 3.0

A dark metallic background with a pattern of stamped dots. Here's a dark "metallic" background pattern for you.

Source V. Hartikainen

Stardust #1209
 Dark  CC BY-SA 3.0

Everyone needs some stardust. Sprinkle it on your next project.

Source Atle Mo

Vintage Clay Tile 1 #1458
 Unknow  CC 0

Gamedev - Roofs Textures. CC0 License.

Source Davit Masia

Colorful Floral Pattern Background 3-remix #215
 Noise  CC 0

This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.

Source Yamachem

Zodiac pattern (black background) #267
 Dark  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. Version with black background.

Source Firkin

Colorful Floral [email protected] #480
 Noise  CC 0

Colorful Floral Background

Source GDJ

Leafy pattern 8 #1806
 Dark  CC 0

Inspired by a JPG that was uploaded to Pixabay by kokon_art

Source Firkin

Floral background 21 #1785
 Dark  CC 0

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

Source Firkin

Floral background 10 (colour 2) #2045
 Pink  CC 0

Remixed from a drawing in 'The March of Loyalty', Letitia MacClintock, 1884.

Source Firkin

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

Black paper texture, based on two different images.

Source Atle Mo
Based from Kindle

Background pattern 312 (colour 2) #1859
 Red  CC 0

Alternative colour scheme

Source Firkin

HIXS Evolution #609
 Dark  CC BY-SA 3.0

Heavy depth and shadows here, but might work well on some mobile apps.

Source Damian Rivas