The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
Seamless Prismatic Pythagorean Line Art Pattern No Background. A seamless pattern that includes the original tile (go to Objects / Pattern / Pattern To Objects in Inkscape's menu to extract it).
Source GDJ
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Prismatic Curved Diamond Pattern No Background
Source GDJ
One more sharp little tile for you. Subtle circles this time.
Source Blunia
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
Sort of reminds me of those old house wallpapers.
Source Tish
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
It looks very nice I think.
Source V. Hartikainen
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
From a drawing in 'Picturesque New Guinea', J Lindt, 1887.
Source Firkin
Sweet and subtle white plaster with hints of noise and grunge.
Source Phil Maurer