Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
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
I’m not going to use the word Retina for all the new patterns, but it just felt right for this one. Huge wood pattern for ya’ll.
Source Atle Mo
Prismatic Groovy Concentric Background 4 No Black
Source GDJ
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
It’s big, it’s gradient—and it’s square.
Source Brankic1979
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Prismatic Polka Dots Mark II No Background
Source GDJ
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Remixed from a PNG that was uploaded to Pixabay by k_jprather
Source Firkin
Dark blue concrete wall with some small dust spots.
Source Atle Mo
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin