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
And some more testing, this time with Seamless Studio. It’s Robots FFS!
Source Seamless Studio
Same classic 45-degree pattern, dark version.
Source Luke McDonald
This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
This is the remix of an OCAL clipart called "Art Nouveau ornament" uploaded by "microcosme".Thanks.This is a seamless pattern of an Art Nouveau ornament.
Source Yamachem
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Embossed lines and squares with subtle highlights.
Source Alex Parker
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A bit like some carbon, or knitted netting if you will.
Source Anna Litvinuk
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev
The original enhanced with some gradients.
Source Firkin
The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
A background pattern with wavy green vertical stripes. This one has green stripes on a white background. Download if you like it.
Source V. Hartikainen
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ