Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Tiny circle waves, almost like the ocean.
Source Sagive
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Groovy Concentric Background 5
Source GDJ
Classic vertical lines, in all its subtlety.
Source Cody L
This is so subtle: We’re talking 1% opacity. Get your squint on!
Source Atle Mo
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Alternative colour scheme to the original.
Source Firkin
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
Just what the name says, paper fibers. Always good to have.
Source Heliodor jalba
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
A heavy dark gray base, some subtle noise and a 45-degree grid makes this look like a pattern with a tactile feel to it.
Source Atle Mo
A free background pattern with abstract green tiles.
Source V. Hartikainen