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
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Here's a new background image for websites with a seamless pink texture. It should look beautiful with website themes where light pink background is needed. The background is seamless, therefore it should be used as a tiled background.
Source V. Hartikainen
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
White handmade paper pattern with small bumps.
Source Marquis
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Prose and Verse ', William Linton, 1836.
Source Firkin
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Green Web Background, Seamless tile.
Source V. Hartikainen
More in the paper realm, this time with fibers.
Source Jorge Fuentes
A floral background formed from numerous clones of flower 117.
Source Firkin
Did anyone say The Hoff? This pattern is in no way related to Baywatch.
Source Josh Green
Vertical lines with a bumpy, yet crisp, feel to it.
Source Raasa
This is the third pattern called Dark Denim, but hey, we all love them!
Source Brandon Jacoby
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
Background formed from the original with an emboss effect
Source GDJ