Remixed from a drawing in 'An Index to Deering's Nottinghamia Vetus et Nova', Rupert Chicken, 1899. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
The following orange background pattern resembles a honeycomb.
Source V. Hartikainen
You know you love wood patterns, so here’s one more.
Source Richard Tabor
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
A free repetitive background with a dark concrete wall like texture. This one may be used in dark web site designs.
Source V. Hartikainen
Prismatic Floral Background No Black
Source GDJ
Zero CC Mossy stone tileable texture, photographed and made by me. CC0
Source Sojan Janso
Lovely pattern with splattered vintage speckles.
Source David Pomfret
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
Prismatic Curved Diamond Pattern 4 No Background
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 background pattern with a look of rough fabric.
Source V. Hartikainen