Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
A seamless texture of black leather. I think it will look best when used in headers, footers or sidebars.
Source V. Hartikainen
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
Original seamless pattern with an Inkscape filter.
Source Firkin
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
I guess this is inspired by the city of Ravenna in Italy and its stone walls.
Source Sentel
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Prismatic Groovy Concentric Background No Black
Source GDJ
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
Colorful Floral Background 3 No Black
Source GDJ
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
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Classic vertical lines, in all its subtlety.
Source Cody L
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin