Black And White Floral Pattern Background Inverse
Source GDJ
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
This one is so simple, yet so good. And you know it. Has to be in the collection.
Source Gluszczenko
I guess this one is inspired by an office. A dark office.
Source Andrés Rigo.
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
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
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
Abstract Arbitrary Geometric Background derived from an image on Pixabay.
Source GDJ
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Heavily remixed from a drawing in 'Barbara Leybourne; a story of eighty years ago', Sarah Hamer, 1889.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A new one called white wall, not by me this time.
Source Yuji Honzawa
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin