Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
A black tile-able background with paper-like texture.
Source V. Hartikainen
A dark metal plate with an embossed grid pattern and a bit of rust. Here's a dark metal plate texture for use as a tiled background on web pages.
Source V. Hartikainen
Alternative colour scheme to the original.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
It’s an egg, in the form of a pattern. This really is 2012.
Source Paul Phönixweiß
Here's a subtle marble-like background for use on websites.
Source V. Hartikainen
Prismatic Polyskelion Pattern No Background
Source GDJ
Derived from a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Colored maple leaves scattered on a surface. This is tileable, so it can be used as a background or wallpaper.
Source Eady
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Geometric Pattern Background 2
Source GDJ
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Alternative colour scheme. Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ