After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Lovely pattern with splattered vintage speckles.
Source David Pomfret
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
This one has rusty dark brown texture.
Source V. Hartikainen
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
This seamless pattern consists of a blue grid on a yellow background.
Source V. Hartikainen
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin