From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Abstract Tiled Background Extended 12
Source GDJ
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Embossed lines and squares with subtle highlights.
Source Alex Parker
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Prismatic Geometric Tessellation Pattern 3 No Background
Source GDJ
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Textured Red Brown Plastic, Free Background Pattern. Although there's already enough plastic in our lives, let's bring it to the web too.)
Source V. Hartikainen
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
A free pink background pattern.
Source V. Hartikainen
You know I love paper patterns. Here is one from Stephen. Say thank you!
Source Stephen Gilbert
Geometric triangles seem to be quite hot these days.
Source Pixeden
The original enhanced with one of Inkscapes's filters.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
A black tile-able background with paper-like texture.
Source V. Hartikainen