A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
More carbon fiber for your collections. This time in white or semi-dark gray.
Source Badhon Ebrahim
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
The image depicts polka dot seamless pattern.
Source Yamachem
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin
Just like the black maze, only in light gray. Duh.
Source Peax
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
It looks very nice I think.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Abstract Geometric Background 5
Source GDJ
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso