Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Medium gray pattern with small strokes to give a weave effect.
Source Catherine
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
That’s what it is, a dark dot. Or sort of carbon looking.
Source Tsvetelin Nikolov
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
Prismatic Groovy Concentric Background
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Old China with a modern twist, take two.
Source Adam Charlts
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Remixed from an image on Pixabay uploaded by Prawny
Source Firkin
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Psychedelic Geometric Background No Black
Source GDJ
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ