Dark pattern with some nice diagonal stitched lines crossing over.
Source Ashton
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
It has waves, so make sure you don’t get sea sickness.
Source CoolPatterns
A free pink background pattern.
Source V. Hartikainen
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
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
Formed by distorting the inside front cover of 'Diversæ insectarum volatilium : icones ad vivum accuratissmè depictæ per celeberrimum pictorem', Jacob Hoefnagel, 1630.
Source Firkin