A comeback for you: the popular Escheresque, now in black.
Source Patten
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
A seamless pattern formed from miutopia mug remixes on a tablecloth.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Prismatic Abstract Background Design No Black
Source GDJ
Dark, lines, noise, tactile. You get the drift.
Source Anatoli Nicolae
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
This seamless web background texture looks like gray stone. It's great for using as a background image on web pages, or on some of their elements. Anyway, I hope you will find use for it.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin