Luxurious looking pattern (for a T-shirt maybe?) with a hint of green.
Source Simon Meek
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Abstract Geometric Background 5
Source GDJ
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
Remixed from a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Prismatic Geometric Pattern Background 2
Source GDJ
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
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
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A white version of the very popular linen pattern.
Source Ant Ekşiler
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