CC0 and seamless wellington boot pattern.
Source SliverKnight
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'An Old Maid's Love. A Dutch tale told in English', Maarten Maartens, 1891.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Vector version of a JPG that was uploaded to Pixabay by theasad121
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
The image depicts a seamless pattern of Japanese Edo pattern called "kikkou-matsu" or "亀甲松" meaning " tortoiseshell-pinetree".The real pinetree is like this: https://jp.pinterest.com/pin/500744052301065077/
Source Yamachem
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
You know you love wood patterns, so here’s one more.
Source Richard Tabor
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Prismatic Curved Diamond Pattern 2 No Background
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin