Carbon Fiber #3
 Carbon  CC BY-SA 3.0

A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.

Source Atle Mo

 More Textures
Worn [email protected] #710
 Fabric  CC BY-SA 3.0

These dots are already worn for you, so you don’t have to.

Source Matt McDaniel

Cells #1285
 Paper  CC 0

Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0

Source Sojan Janso

Leaded glass background (colour 3) #2052
 Colorful  CC 0

Seamless pattern the tile.

Source Firkin

Floors #1590
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Background pattern 21 #205
 Light  CC 0

A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.

Source Firkin

Retro Squares Background [email protected] #798
 Noise  CC 0

Retro Squares Background 6

Source GDJ

Tex2res1 #721
 Fabric  CC BY-SA 3.0

Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.

Source Janos Koos

Prismatic Curved Diamond Pattern 3 No [email protected] #540
 Diamond  CC 0

Prismatic Curved Diamond Pattern 3 No Background

Source GDJ

Background pattern 314 (colour 2) #1838
 Green  CC 0

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

Source Firkin

Prismatic Hypnotic Pattern 2 No [email protected] #574
 Noise  CC 0

Prismatic Hypnotic Pattern 2 No Background

Source GDJ

White [email protected] #369
 Wall  CC BY-SA 3.0

Sweet and subtle white plaster with hints of noise and grunge.

Source Phil Maurer

Dungeons & Flagons 10 #1426
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Mossy Wall #1269
 Wall  CC 0

Zero CC Mossy stone tileable texture, photographed and made by me. CC0

Source Sojan Janso

[email protected] #134
 Light  CC BY-SA 3.0

This reminds me of Game Cube. A nice light 3D cube pattern.

Source Sander Ottens

Cardboard [email protected] #962
 Gray  CC BY-SA 3.0

Not a flat you live inside, like in the UK – but a flat piece of cardboard.

Source Appleshadow

[email protected] #975
 Gray  CC BY-SA 3.0

There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.

Source Dominik Kiss

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

Retro Circles Background 4 No Black

Source GDJ

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

Modern #1686
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Dotnoise Light Grey #308
 Wall  CC BY-SA 3.0

Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!

Source Nikolalek

Cheap Diagonal Fabric #1345
 Gray  CC BY-SA 3.0

Fabric is never out of style.

Source Ufuk Sarp Selçok

Background pattern 246 #2186
 Red  CC 0

This was formed by distorting an image of a background on Pixabay.

Source Firkin

Background pattern 215 #2371
 Brown  CC 0

A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.

Source Firkin

Brick #1376
 Wall  CC 0

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

Source Linolafett

Dark Line #1294
 Stone  CC 0

ZeroCC tileable stone texture, edited from pixabay. CC0

Source Sojan Janso

Wood 1 #1443
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia