Gradient Squares #693
 Grid  CC BY-SA 3.0

It’s big, it’s gradient—and it’s square.

Source Brankic1979

 More Textures
Retro Squares Background [email protected] #799
 Dark  CC 0

Retro Squares Background 5

Source GDJ

[email protected] #295
 Wall  CC BY-SA 3.0

A nice and simple gray stucco material. Great on its own, or as a base for a new pattern.

Source Bartosz Kaszubowski

Prismatic Groovy Concentric Background 5 No Black #467
 Dark  CC 0

Prismatic Groovy Concentric Background 5 No Black

Source GDJ

Wild Flowers #1181
 Gray  CC BY-SA 3.0

Tiny little flowers growing on your screen. Nice, huh?

Source Themes Tube

Floral background 18 (negative) #1832
 Dark  CC 0

Negative version of the original

Source Firkin

Colorful Paw Prints Pattern Background #260
 Noise  CC 0

pixabay.

Source GDJ

Leaded glass background (colour 5) #2050
 Colorful  CC 0

Seamless pattern the tile.

Source Firkin

Vintage pattern #2296
 Brown  CC 0

Inspired by a pattern seen on a public domain image of a very old tile. To get the unit cell, select the rectangle in Inkscape and use shift+alt+i.

Source Firkin

Prismatic Geometric Pattern Background [email protected] #785
 Noise  CC 0

Prismatic Geometric Pattern Background 2

Source GDJ

Triangular Psychosis 3 #235
 Noise  CC 0

A colorful triangular background, variation 3.

Source GDJ

Retro Squares Background 4 #418
 Dark  CC 0

Retro Squares Background 4

Source GDJ

Blue & Fissure & Cube #1702
 Wall  CC 0

Background Wall, Art Abstract, Blue Well & CC0 texture.

Source Ractapopulous

Eight Horns #1325
 Light  CC BY-SA 3.0

Looks like an old rug or a computer chip.

Source Patutin Sergey

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

Floral design #1984
 Green  CC 0

Remixed from a drawing in 'Line and form', Walter Crane, 1914.

Source Firkin

Textured Red Brown Plastic #878
 Wood  CC BY-SA 3.0

Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)

Source V. Hartikainen

Cross Stripes #47
 Dark  CC BY-SA 3.0

Nice and simple crossed lines in dark gray tones.

Source Stefan Aleksić

Cloth & Gray #1621
 Fabric  CC 0

Fabric. CC0 License.

Source Unknow

Background pattern 222 #2345
 Green  CC 0

Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

overlay crack #153
 Noise  CC 0

This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.

Source Lazur URH

Cutcube #629
 Diamond  CC BY-SA 3.0

Cubes, geometry, 3D. What’s not to love?

Source Michael Atkins

Background pattern black #2026
 Dark  CC 0

Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Subtle [email protected] #922
 Light  CC BY-SA 3.0

As simple and subtle as it gets. But sometimes that’s just what you want.

Source Designova

[email protected] #578
 Paper  CC BY-SA 3.0

With a name like this, it has to be hot. Diagonal lines in light shades.

Source Isaac

Gray Floral #755
 Gray  CC BY-SA 3.0

Floral patterns might not be the hottest thing right now, but you never know when you need it!

Source Lauren

Pine Bark #1276
 Wall  CC 0

Zero CC tileable pine bark texture, photographed and made by me. CC0

Source Sojan Janso

Brick #1377
 Wall  CC 0

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

Source Linolafett

Translucent [email protected] #944
 Light  CC BY-SA 3.0

The file was named striped lens, but hey – Translucent Fibres works too.

Source Angelica

[email protected] #355
 Wall  CC BY-SA 3.0

I guess this is inspired by the city of Ravenna in Italy and its stone walls.

Source Sentel