Some rectangles, a bit of dust and grunge, plus a hint of concrete.
Source Atle Mo
Zero CC asphalt, pavement, texture, photographed and made by me. CC0 WARNING I FOUND A SEAM ON THIS TEXTURE
Source Sojan Janso
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
Prismatic Curved Diamond Pattern No Background
Source GDJ
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
8 by 8 pixels, and just what the title says.
Source pixilated
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
This light yellow background pattern consists of an irregular pattern of spots. Here's a light background pattern with yellowish tint.
Source V. Hartikainen
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ