It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Derived from an image that was uploaded to Pixabay by Darkmoon1968
Source Firkin
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Scanned some rice paper and tiled it up for you. Enjoy.
Source Atle Mo
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Fix and cc0 to get the tile this is based on.
Source SliverKnight
From an image on opengameart.org shared by rubberduck.
Source Firkin
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
A free tileable background colored in off-white (antique white) color.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
A version without colours blended together to give a different look.
Source Firkin