This was formed by distorting an image of a background on Pixabay.
Source Firkin
The image is a remix of "edo pattern-samekomon".I changed the color of dots from black to white and added BG in light-yellow.
Source Yamachem
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
It looks like a polished stone surface to me. Download it for free, as always.
Source V. Hartikainen
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
High detail stone wall with minor cracks and specks.
Source Projecteightyfive
Geometric lines are always hot, and this pattern is no exception.
Source Listvetra
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
A dark gray, sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
A free seamless background image with abstract texture of green "curtain".
Source V. Hartikainen
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Seamless pattern made from a tile that can be obtained in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
A seamlessly tile-able grunge background image.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
A light gray wall or floor (you decide) of concrete.
Source Atle Mo
Prismatic Rounded Squares Grid 3 No Background
Source GDJ
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
This is so subtle I hope you can see it! Tweak at will.
Source Alexandre Naud
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall