A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
Old China with a modern twist, take two.
Source Adam Charlts
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
From a drawing in 'Az Osztrák-Magyar Monarchia irásban és képben', 1885.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Prismatic Groovy Concentric Background 4
Source GDJ
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen