As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
A version without colours blended together to give a different look.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
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
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
A seamlessly tile-able grunge background image.
Source V. Hartikainen
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
A seamless pattern of "sewn stripes" colored in light gray.
Source V. Hartikainen
Alternative colour scheme for the original floral pattern.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
This one is quite simple in design, it consists of vertical stripes layered on top of a seamless texture.
Source V. Hartikainen
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
This background image has seamless texture that resembles a surface of gray stone.
Source V. Hartikainen
I love the movie Pineapple Express, and I’m also liking this Pineapple right here.
Source Audee Mirza
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
The starting point for this was a texture drawn with the 'Radial Colors' plug-in in Paint.net.
Source Firkin