Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
From a drawing of the coat of arms of the Ottoman Empire on Wikimedia.
Source Firkin
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Background Wall, Art Abstract, Star Well & CC0 texture.
Source Ractapopulous
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
This one is amazing, truly original. Go use it!
Source Viahorizon
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
From a drawing in 'A Life Interest', Mrs Alexander, 1888.
Source Firkin
The base gradient edited so now more details are rendered.
Source Lazur URH
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
A green background pattern with warped vertical stripes and a grunge look.
Source V. Hartikainen