One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
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
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background derived from an image on Pixabay.
Source GDJ
Black brick wall pattern. Brick your site up!
Source Alex Parker
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
From a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
A pattern derived from part of a fractal rendering in Paint.net.
Source Firkin
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
From a drawing in 'Hubert Montreuil, or the Huguenot and the Dragoon', Francisca Ouvry, 1873.
Source Firkin
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Colorful Floral Background 3 No Black
Source GDJ
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
A seamless marble-like texture colored in light blue.
Source V. Hartikainen