This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
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
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim
Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
From a drawing in 'Worsborough; its historical associations and rural attractions', Joseph Wilkinson, 1879.
Source Firkin
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A free grid paper background pattern for using on web sites.
Source V. Hartikainen
Prismatic Abstract Background Design No Black
Source GDJ
An interesting dark spotted pattern at an angle.
Source Hendrik Lammers
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
CC0 remixed from a drawing. Walter Crane, 1914, Firkin.
Source SliverKnight
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A bit of scratched up grayness. Always good.
Source Dmitry
If you don’t like cream and pixels, you’re in the wrong place.
Source Mizanur Rahman