This was formed by distorting an image of a background on Pixabay.
Source Firkin
Submitted by DomainsInfo – wtf, right? But hey, a free pattern.
Source DomainsInfo
Prismatic Polyskelion Pattern No Background
Source GDJ
A version without colours blended together to give a different look.
Source Firkin
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. Version with black background.
Source Firkin
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
From a drawing in 'A Rolling Stone. A tale of wrongs and revenge', John Hartley, 1878.
Source Firkin
The file was named striped lens, but hey – Translucent Fibres works too.
Source Angelica
A free seamless texture of reptile skin colored in a dark brown color. As always, you may use it as a repeated background image in your web design works, or for any other purposes.
Source V. Hartikainen
Free tiled background with colorful stripes and white splatter.
Source V. Hartikainen
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
Looks a bit like concrete with subtle specks spread around the pattern.
Source Mladjan Antic
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
An attempt for cleaning up the original image in a few steps.
Source Lazur URH