As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A floral background formed from numerous clones of flower 117.
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
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Remixed from a JPG that was uploaded to Pixabay by Osckar
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
A free pink background pattern.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
Greyscale version of a pattern that came out of playing with the 'slinky' plug-in for Paint.net
Source Firkin
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Prismatic Abstract Line Art Pattern Background
Source GDJ