The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
Remixed from a raster on Pixabay, that was uploaded by ArtsyBee.
Source Firkin
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
A seamless pattern based on a rectangular tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
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
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Tiny circle waves, almost like the ocean.
Source Sagive
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
It was called Navy Blue, but I made it dark. You know, the way I like it.
Source Ethan Hamilton
A chequerboard pattern with a fruit theme. The fruits are from a posting by inkscapeforum.it.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ