This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Run a restaurant blog? Here you go. Done.
Source Andrijana Jarnjak
A seamless pattern formed from a tile made from page ornament 22. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
This was submitted in a beige color, hence the name. Now it’s a gray paper pattern.
Source Konstantin Ivanov
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry