Dark Brick Pattern #1032
 Stone  CC BY-SA 3.0

A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.

Source V. Hartikainen

 More Textures
Brushed Aluminum 5 #1393
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Wavy background #2012
 Green  CC 0

A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic

Source Firkin

Psychedelic Geometric Background No [email protected] #812
 Noise  CC 0

Psychedelic Geometric Background No Black

Source GDJ

Glass block pattern #2477
 Brown  CC 0

Produced using the clouds, flames and glass blocks plug-ins in Paint.net and the resulting .PNG vectorised with Vector Magic.

Source Firkin

Square ornament 37 #2177
 Dark  CC 0

Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.

Source Firkin

Prismatic Geometric Tessellation Pattern No Background #551
 Noise  CC 0

Prismatic Geometric Tessellation Pattern No Background

Source GDJ

Floral design 99 (colour) #1777
 Green  CC 0

From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.

Source Firkin

Leafy pattern 11 #1765
 Dark  CC 0

From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.

Source Firkin

Ribbon pattern 2 (version 2, colour 3) #2037
 Colorful  CC 0

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

Source Firkin

Mix & Black Pattern #1629
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Brushed Aluminum 4 #1392
 Metal  CC 0

Gamedev - Metal Textures. CC0 License.

Source Davit Masia

Guitarpick #1682
 Paper  CC 0

Paper-Wallpaper. CC0 License.

Source Unknow

Asfalt #927
 Dark  CC BY-SA 3.0

A very dark asfalt pattern based off of a photo taken with my iPhone.

Source Atle Mo

Pattern & Plywood #1347
 Wood  CC 0

CC0 for Free, hope you like it.

Source Yethiel

Floral pattern 9 #2043
 Dark  CC 0

The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.

Source Firkin

Stone Wall & Gray #1512
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Zodiac pattern #2407
 Colorful  CC 0

A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i

Source Firkin

Yellow Wood Planks Background #876
 Wood  CC BY-SA 3.0

This background pattern contains a texture of yellow wood planks. I think it looks quite original.

Source V. Hartikainen

plant pattern 01 #2507
 Unknow  CC 0

The image is a seamless pattern which is derived from a vine .Consequently, the vine got like dots via vectorization.The original vine is here:jp.pinterest.com/pin/500744052301410188/

Source Yamachem

Escheresque #777
 Light  CC BY-SA 3.0

Cubes as far as your eyes can see. You know, because they tile.

Source Jan Meeus

Leafy pattern black #1972
 Dark  CC 0

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

Source Firkin

Tessellation 16 (colour 2) #2214
 Colorful  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

Background pattern 9 (greyscale) #213
 Dark  CC BY-SA 3.0

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

Source Firkin

Colorful Bicycles Background #207
 Noise  CC 0

Pixabay.

Source GDJ

Background pattern 308 (colour 3) #1870
 Colorful  CC 0

Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.

Source Firkin

Stone Wall & Gray #1560
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Stone & Dark #1564
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Ice Age #637
 Paper  CC BY-SA 3.0

I asked Gjermund if he could make a pattern for us – result!

Source Gjermund Gustavsen