Colourful background #2007
 Colorful  CC 0

Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic

Source Firkin

 More Textures
Bamboo Background Pattern #1330
 Green  CC BY-SA 3.0

This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).

Source V. Hartikainen

"Light Green Wall", Repeatable Texture #1190
 Concrete  CC BY-SA 3.0

Here's a repeatable texture that resembles a light green concrete wall or something similar.

Source V. Hartikainen

Background pattern 265 #2081
 Dark  CC 0

Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i

Source Firkin

Floral Abstract Pattern Background #217
 Noise  CC 0

PDP

Source GDJ

Floral background #1964
 Dark  CC 0

Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.

Source Firkin

Paper model of a tetrahedron #139
 Unknow  CC 0

Paper model of a tetrahedron. Modelo de papel de um tetraedro.

Source laobc

Background pattern 243 (colour 2) #2196
 Colorful  CC 0

Random colour tile.

Source Firkin

Inflicted #117
 Grid  CC BY-SA 3.0

Dark squares with some virus-looking dots in the grid.

Source Hugo Loning

Stone Wall & Dark #1547
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Dungeons & Flagons 7 #1423
 Diamond  CC 0

Gamedev - Floors Textures. CC0 License.

Source Davit Masia

Chainmail & Iron #1643
 Metal  CC 0

Metal-Processed. CC0 License.

Source Unknow

Part of Bayeux Tapestry 4 #2446
 Noise  CC 0

From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.

Source Firkin

Brick texture floor #1704
 Wall  CC 0

Found on the ground in french cafe in kunming, Yunnan, china

Source Rejon

Stone Wall & Purple #1567
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Floors & Dark Stone #1594
 Wall  CC 0

Floors-Tiles. CC0 License.

Source Unknow

Mix & Red Pattern #1630
 Metal  CC 0

Metal-Plain or Painted. CC0 License.

Source Unknow

Love decorative divider #1910
 Colorful  CC 0

Vector version of a png that was uploaded to Pixabay by pencilparker

Source Firkin

Stone Wall & Gray #1510
 Stone  CC 0

Incoming catena. Stone & well. CC0 texture.

Source Unknow

Melty & Red #1665
 Metal  CC 0

Misc. CC0 License.

Source Unknow

Background pattern 309 (colour 3) #1864
 Red  CC 0

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

Source Firkin

Prismatic Hypnotic Pattern No Background #571
 Noise  CC 0

Prismatic Hypnotic Pattern No Background

Source GDJ

Background pattern 19 (black) #203
 Dark  CC 0

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

Source Firkin

Sine wave background 2 #1734
 Dark  CC 0

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

Source Firkin

White tiles #727
 Grid  CC BY-SA 3.0

A nice and simple white rotated tile pattern.

Source Another One

Concrete 2 Col #1466
 Gray  CC 0

Ground style CC0 texture.

Source StruffelProductions

Vertical Cloth #597
 Dark  CC BY-SA 3.0

You just can’t get enough of the fabric patterns, so here is one more for your collection.

Source Krisp Designs