Prismatic Abstract Geometric Background 2 No Black
Source GDJ
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
I know there is one here already, but this is sexy!
Source Gjermund Gustavsen
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Subtle scratches on a light gray background.
Source Andrey Ovcharov
Nice little grid. Would work great as a base on top of some other patterns.
Source Arno Gregorian
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
This texture looks like old leather. It should look great as a background on web pages.
Source V. Hartikainen
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Spice up your next school project with this icon background.
Source Swetha
Prismatic Isometric Cube Wireframe Pattern No Background
Source GDJ
A version without colours blended together to give a different look.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A very dark asfalt pattern based off of a photo taken with my iPhone.
Source Atle Mo
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
An abstract texture of black metal pipes (seamless).
Source V. Hartikainen
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin