Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
A version without colours blended together to give a different look.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Triangular Background Design Mark II 5
Source GDJ
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
A seamless canvas texture for using as background on websites. Colored in pale tones of brown.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Looks like an old wall. I guess that’s it then?
Source Viahorizon
Prismatic Geometric Pattern Background
Source GDJ
Seamless Green Tile Background
Source V. Hartikainen
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Horizontal and vertical lines on a light gray background.
Source Adam Anlauf
Here's a bluish gray striped background pattern for use on web sites.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc