This was formed by distorting an image of a background on Pixabay.
Source Firkin
I’m starting to think I have a concrete wall fetish.
Source Atle Mo
A seamless pattern of leopard skin. It should look nice as a background element on web pages.
Source V. Hartikainen
Prismatic Snowflakes Pattern 3 No Background
Source GDJ
Remixed from a PNG that was uploaded to Pixabay by VictorianLady
Source Firkin
A pattern formed from a photograph of a 16th century ceramic tile.
Source Firkin
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
Here's a dark background pattern that contains a steel grid pattern as a texture. Use it as a website background or for other purposes. It's free!
Source V. Hartikainen
A dark one with geometric shapes and dotted lines.
Source Mohawk Studios
The name Paisley reminds me of an old British servant. That’s just me.
Source Swetha
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
Farmer could be some sort of fabric pattern, with a hint of green.
Source Fabian Schultz
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
Prismatic Abstract Background Design
Source GDJ
Colour version of the original seamless pattern.
Source Firkin
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
A light gray fabric pattern with faded vertical stripes.
Source V. Hartikainen
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks.
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Not strictly seamless in that opposite edges are not identical. But they do marry up to make an interesting pattern
Source Firkin