A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
This one needs to be used in small areas; you can see it repeat.
Source Luca
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
To get the tile this is formed from 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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless background texture of old cardboard.
Source V. Hartikainen
A series of 5 patterns. That’s what the P stands for, if you didn’t guess it.
Source Dima Shiper
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton