A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Here's a repeatable texture that resembles a light green concrete wall or something similar.
Source V. Hartikainen
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Zero CC tileable moss or lichen covered stone texture, edited from pixabay. CC0
Source Sojan Janso
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Washi (和紙?) is a type of paper made in Japan. Here’s the pattern for you!
Source Carolynne
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Derived from a design in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Inspired by a JPG that was uploaded to Pixabay by kokon_art
Source Firkin
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Remixed from a drawing in 'Line and form", Walter Crane, 1914.
Source Firkin
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
Light gray paper pattern with small traces of fiber and some dust.
Source Atle Mo