Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Black And White Floral Pattern Background Inverse
Source GDJ
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Prismatic Snowflakes Pattern No Background
Source GDJ
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Classy golf-pants pattern, or crossed stripes if you will.
Source Will Monson
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Prismatic Groovy Concentric Background 2
Source GDJ
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
A seamless pattern formed from cross 4. To get the original tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Seamless Light Background Texture.
Source V. Hartikainen
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin