You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
This was formed by distorting an image of a background on Pixabay.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
From a drawing in 'Gately's World's Progress', Charles Beale, 1886.
Source Firkin
Remixed 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
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
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
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Tiny little flowers growing on your screen. Nice, huh?
Source Themes Tube