A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
Zero CC tileable brick texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Polka Dots 3 No Background
Source GDJ
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Alternative colour scheme for the original floral pattern.
Source Firkin
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
A seamless background of warped stripes on paper.
Source V. Hartikainen
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
A background tile for web with abstract repeating texture of dark "stone wall".
Source V. Hartikainen
Geometric triangles seem to be quite hot these days.
Source Pixeden
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Prepared mostly as a raster in Paint.net and vectorised.
Source Firkin