A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
From a drawing in 'Storia del Palazzo Vecchio in Firenze', Aurelio Gotti, 1889.
Source Firkin
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Pattern Background, Texture, Photoshop Structure style CC0 texture.
Source Darkmoon1968
A repeating gloomy background image. This one consists of a pattern of black chains layered on top of a dark textured background.
Source V. Hartikainen
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
A comeback for you: the popular Escheresque, now in black.
Source Patten
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim