A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Derived from a drawing in 'Historiske Afhandlinger', Adolf Jorgensen, 1898.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Can never have too many knitting patterns, especially as nice as this.
Source Victoria Spahn
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert