Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Geometric triangles seem to be quite hot these days.
Source Pixeden
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
Wasn't satisfied with the original's colouring. Too much component transfer and colormatrixes yet the results are lacking a bit. So this time it is a simple black to transparent fade, making it possible remixing easily once there will be other blending modes supported as well. Probably in inkscape 0.92.
Source Lazur URH
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-brown.
Source Yamachem
Black brick wall pattern. Brick your site up!
Source Alex Parker
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
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
Colorful Floral Background 3 No Black
Source GDJ
Prismatic Polka Dots Mark II No Background
Source GDJ
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Prismatic Groovy Concentric Background
Source GDJ
A seamless pattern of dark bricks. Maybe it's not very realistic, but it looks good in my opinion.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
A comeback for you: the popular Escheresque, now in black.
Source Patten
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin