Mooning #1140
 Gray  CC BY-SA 3.0

The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?

Source Joel Klein

 More Textures
Abstract Stars Geometric Pattern Prismatic No [email protected] #810
 Noise  CC 0

Abstract Stars Geometric Pattern Prismatic No Background

Source GDJ

Paper Blank 3 #2117
 Paper  CC 0

CC0 textures, backgrounds.

Source SliverKnight

Background pattern 9 (colour) #214
 Noise  CC 0

Colour version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net

Source Firkin

Floral background 17 (colour 3) #1849
 Blue  CC 0

Remixed from a JPG that was uploaded to Pixabay by theasad121

Source Firkin

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

Prismatic Curved Diamond Pattern 2 No Background

Source GDJ

Embossed [email protected] #732
 Paper  CC BY-SA 3.0

One more from Badhon, sharp horizontal lines making an embossed paper feeling.

Source Badhon Ebrahim

Subtle Stripes #751
 Stripes  CC BY-SA 3.0

Vertical lines with a bumpy, yet crisp, feel to it.

Source Raasa

Pewter & Gray #1637
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Sneaker Mesh Fabric #1101
 Light  CC BY-SA 3.0

Snap! A crisp pixel pattern.

Source Victor Bejar

Prismatic Hexagonalism Pattern No Background #391
 Light  CC 0

Prismatic Hexagonalism Pattern No Background

Source GDJ

Wild [email protected] #989
 Dark  CC BY-SA 3.0

Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.

Source Badhon Ebrahim

Cream Dust #980
 Light  CC BY-SA 3.0

I love cream! 50x50px and lovely in all the good ways.

Source Thomas Myrman

Wood Texgen 6 #1440
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Chipboard 3 #2193
 Wood  CC 0

Seamless texture made from a raster image on Pixabay

Source Firkin

Background pattern 238 #2229
 Red  CC 0

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

Source Firkin

Prismatic Diamond Background [email protected] #811
 Diamond  CC 0

Prismatic Diamond Background 6

Source GDJ

Stone & Dark #1564
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

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

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

Source AdamStanislav

Abstract Tiled Background Extended 8 #519
 Noise  CC 0

Abstract Tiled Background Extended 8

Source GDJ

Mix & Black Pattern #1629
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Floors & Dark Wood #1615
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Starry Star #1918
 Dark  CC 0

Fix side and a seamless starry tile.

Source SliverKnight

Retro Circles Background 5 #424
 Noise  CC 0

Retro Circles Background 5

Source GDJ

Sativa #1306
 Dark  CC BY-SA 3.0

Honestly, who does not like a little pipe and mustache?

Source Luca Errico

[email protected] #315
 Paper  CC BY-SA 3.0

Floral patterns will never go out of style, so enjoy this one.

Source Lasma

[email protected] #76
 Light  CC BY-SA 3.0

If you like it a bit trippy, this wave pattern might be for you.

Source Ian Soper