Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A seamless design of flowers remixed from a jpg on Pixabay by Prawny.
Source Firkin
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
ZeroCC tileable stone texture, edited from pixabay. CC0
Source Sojan Janso
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
The tile this is formed from can be retrieved in Inkscape by selecting the rectangle and using shift+alt+i
Source Firkin
The image depicts a seamless pattern of a Japanese family crest called "chidori" in Japanese .A chidori in Japanese means a plover in English.
Source Yamachem
Prismatic Abstract Geometric Background 3
Source GDJ
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Remixed from a design seen on Pixabay. The basic tile 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
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
A seamlessly tile-able grunge background image.
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Remixed from a PNG that was uploaded to Pixabay by gingertea
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock