A comeback for you: the popular Escheresque, now in black.
Source Patten
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Prismatic Snowflakes Pattern No Background
Source GDJ
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Number 3 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
A seamless texture of a rough concrete surface.
Source V. Hartikainen
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
A large pattern with funky shapes and form. An original. Sort of origami-ish.
Source Luuk van Baars
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
From drawing in 'Musings in Maoriland', Thomas Bracken, 1890.
Source Firkin
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Prismatic Groovy Concentric Background
Source GDJ
Colour version of the original pattern inspired by the front cover of 'Old and New Paris', Henry Edwards, 1894.
Source Firkin