Pattern & Plywood #1349
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

 More Textures
Dark Geometric #619
 Dark  CC BY-SA 3.0

Continuing the geometric trend, here is one more.

Source Mike Warner

Blue Stripes Pattern #969
 Stripes  CC BY-SA 3.0

A textured blue background pattern with vertical stripes.

Source V. Hartikainen

Prismatic Abstract Geometric Background 5 No [email protected] #792
 Noise  CC 0

Prismatic Abstract Geometric Background 5 No Black

Source GDJ

Retro Circles Background 4 No [email protected] #423
 Dark  CC 0

Retro Circles Background 4 No Black

Source GDJ

Subtle [email protected] #926
 Light  CC BY-SA 3.0

Super subtle indeed, a medium gray pattern with tiny dots in a grid.

Source Designova

Rough Concrete Surface #1194
 Concrete  CC BY-SA 3.0

A seamless texture of a rough concrete surface.

Source V. Hartikainen

Retro Squares Background [email protected] #419
 Dark  CC 0

Retro Squares Background 4

Source GDJ

Background pattern 322 #1823
 Yellow  CC 0

Derived from an image on Pixabay

Source Firkin

Flourish pattern (colour 2) #1738
 Red  CC 0

Remixed from an image that was uploaded to Pixabay by Pixeline

Source Firkin

Background pattern 270 #2061
 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

Background pattern 262 #2075
 Dark  CC 0

Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.

Source Firkin

Stone Wall & Yellow #1528
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Background pattern 234 (colour 2) #2258
 Green  CC 0

Drawn in Paint.net and vectorised in Vector Magic.

Source Firkin

Greek key pattern 5 #2294
 Dark  CC 0

Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.

Source Firkin

Floors & Black #1608
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Retro Squares Background 6 #396
 Noise  CC 0

Retro Squares Background 6

Source GDJ

Background pattern 250 (colour 3) #2169
 Colorful  CC 0

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

Source Firkin

Maze [email protected] #1047
 Light  CC BY-SA 3.0

Just like the black maze, only in light gray. Duh.

Source Peax

Prismatic Dots Background 4 #507
 Noise  CC 0

Prismatic Dots Background 4

Source GDJ

Gray Lines #913
 Light  CC BY-SA 3.0

Some more diagonal lines and noise, because you know you want it.

Source Atle Mo

Always [email protected] #54
 Dark  CC BY-SA 3.0

Crossing lines with a subtle emboss effect on a dark background.

Source Stefan Aleksić

Vintage Clay Tile 5 #1462
 Unknow  CC 0

Gamedev - Roofs Textures. CC0 License.

Source Davit Masia

Decorative divider 254 #2040
 Dark  CC 0

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

Source Firkin

Page ornament #1992
 Dark  CC 0

Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.

Source Firkin

Brick #1377
 Wall  CC 0

Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!

Source Linolafett

Connected #348
 Light  CC BY-SA 3.0

White circles connecting on a light gray background.

Source Mark Collins