Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Remixed from a drawing in 'The Canadian horticulturist', 1892
Source Firkin
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
"Beige Stone", Tileable Texture.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This one needs to be used in small areas; you can see it repeat.
Source Luca
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A mid-tone gray pattern with some cement looking texture.
Source Hendrik Lammers
A free background pattern with abstract green tiles.
Source V. Hartikainen
A seamlessly tile-able grunge background image.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Everyone needs some stardust. Sprinkle it on your next project.
Source Atle Mo
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ