A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A bit strange this one, but nice at the same time.
Source Diogo Silva
Trippy little gradients at an angle.
Source Cary Fleming.
Alternative colour scheme to the original.
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
A bit of scratched up grayness. Always good.
Source Dmitry
Prismatic Snowflakes Pattern No Background
Source GDJ
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
The texture of this background image has some similarities with leather, and it's colored in a dark brown color. So, if you are looking for a dark brown background image for your website, this may be an option for you.
Source V. Hartikainen
Fix and cc0 to get the tile this is based on.
Source SliverKnight
Retro Circles Background 8 No Black
Source GDJ
A lot of people like the icon patterns, so here’s one for your restaurant blog.
Source Andrijana Jarnjak
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin
A pale olive green background with a seamless texture.
Source V. Hartikainen