Swirl #1323
 Light  CC BY-SA 3.0

Lovely gray circles. What more can you ask for?

Source Uday

 More Textures
Well #1261
 Wall  CC 0

Zerro CC tillable texture of stones photographed and made by me. CC0

Source Sojan Janso

Stone Wall & Yellow #1574
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Planks & Roughcedar #1354
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

Background pattern 315 (colour 3) #1843
 Green  CC 0

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

Source Firkin

WaveCut #75
 Light  CC BY-SA 3.0

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

Source Ian Soper

Abstract Water Texture (Seamless) #890
 Water  CC BY-SA 3.0

An abstract texture of water. It's not perfect, but will do. You may download if you like it.

Source V. Hartikainen

Dungeons & Flagons 2 #1418
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Prismatic Geometric Tessellation Pattern 3 No [email protected] #556
 Noise  CC 0

Prismatic Geometric Tessellation Pattern 3 No Background

Source GDJ

Vintage [email protected] #654
 Wall  CC BY-SA 3.0

Lovely pattern with splattered vintage speckles.

Source David Pomfret

Metal & Gray Stone #1656
 Metal  CC 0

Metal-Rusty. CC0 License.

Source Unknow

Stone & Dark #1564
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Noisy Grid #959
 Gray  CC BY-SA 3.0

This is a grid, only it’s noisy. You know. Reminds you of those printed grids you draw on.

Source Vectorpile

Background pattern 258 (colour) #2134
 Red  CC 0

Remixed from a design on Pixabay. To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.

Source Firkin

Deevad Torchon #1667
 Paper  CC 0

Paper. CC0 License.

Source Unknow

Mosaic tile #2481
 Brown  CC 0

From a drawing in 'Handbook of the excursions proposed to be made by the Lincoln Diocesan Architectural Society, on the 27th and 28th of May, 1857', Edward Trollope, 1857.

Source Firkin

Leafy pattern (colour) #2334
 Fabric  CC 0

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

Source Firkin

Tessellation 15 (colour 4) #2219
 Green  CC 0

The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.

Source Firkin

Dark Mosaic #121
 Dark  CC BY-SA 3.0

Small dots with minor circles spread across to form a nice mosaic.

Source John Burks

White [email protected] #728
 Grid  CC BY-SA 3.0

A nice and simple white rotated tile pattern.

Source Another One

Seamless Green Tile Background #1326
 Green  CC BY-SA 3.0

Seamless Green Tile Background

Source V. Hartikainen

Background pattern 231 #2301
 Dark  CC 0

A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.

Source Firkin

Wood Texgen 4 #1438
 Wood  CC 0

Gamedev - Wood Textures. CC0 License.

Source Davit Masia

Lined Paper #1034
 Light  CC BY-SA 3.0

I know there is one here already, but this is sexy!

Source Gjermund Gustavsen

Floral pattern 3 (colour) #2330
 Colorful  CC 0

Adapted from a jpg on Pixabay.

Source Firkin

Background pattern 246 (colour 5) #2182
 Colorful  CC 0

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

Source Firkin

Decorative divider 248 #2074
 Dark  CC 0

From a drawing in 'Picturesque New Guinea', J Lindt, 1887.

Source Firkin

Vintage pattern #1958
 Grid  CC 0

Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.

Source Firkin

Prismatic Abstract Geometric Background [email protected] #793
 Noise  CC 0

Prismatic Abstract Geometric Background 5

Source GDJ

Vintage Clay Tile 1 #1458
 Unknow  CC 0

Gamedev - Roofs Textures. CC0 License.

Source Davit Masia