The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
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
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
These dots are already worn for you, so you don’t have to.
Source Matt McDaniel
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
A seamless background texture of old cardboard.
Source V. Hartikainen
Gold Triangular Seamless Pattern No Background
Source GDJ
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
One can never have too few rice paper patterns, so here is one more.
Source Atle Mo
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
He influenced us all. “Don’t be sad because it’s over. Smile because it happened.”
Source Atle Mo
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Heavily remixed from a drawing that was uploaded to Pixabay by ractapopulous
Source Firkin
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ