A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Remixed from a drawing in 'A Child of the Age', Francis Adams, 1894.
Source Firkin
This is the remix of "polka dot seamless pattern".The image depicts polka dot seamless pattern.
Source Yamachem
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
Might not be super subtle, but quite original in its form.
Source Alex Smith
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
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
Prismatic Groovy Concentric Background 3
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Wild Oliva or Oliva Wilde? Darker than the others, sort of a medium dark pattern.
Source Badhon Ebrahim
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry