A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
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
I took the liberty of using Dmitry’s pattern and made a version without perforation.
Source Atle Mo
Prismatic Abstract Line Art Pattern Background 2
Source GDJ
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
A seamless pattern formed from background pattern 102
Source Firkin
The classic notebook paper with horizontal stripes.
Source Are Sundnes
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
8 by 8 pixels, and just what the title says.
Source pixilated
Colour version that is close to the original drawing uploaded to Pixabay by pencilparker.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
A seamless pattern based on a tile that can be achieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A beautiful dark padded pattern, like an old classic sofa.
Source Chris Baldie
No relation to the band, but damn it’s subtle!
Source Thomas Myrman