Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
This is a seamless pattern of a woody texture.The original image is here:https://pixabay.com/ja/users/ClassicallyPrinted-1302233/
Source Yamachem
Love the style on this one, very fresh. Diagonal diamond pattern. Get it?
Source INS
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
This is the remix of "Colorful Floral Pattern Background 3" uploaded by "GDJ". Thanks.
Source Yamachem
Same as Silver Scales, but in black. Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
This background texture resembles stone. It may be used as a background on web pages or on some of their html elements (header, borders, menu bar, etc.). Just modify it for your needs.
Source V. Hartikainen
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
From a drawing in 'Cassell's Library of English Literature', Henry Morley, 1883.
Source Firkin
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
I’m not going to lie – if you submit something with the words Norwegian and Rose in it, it’s likely I’ll publish it.
Source Fredrik Scheide
Sharp pixel pattern, just like the good old days.
Source Paridhi
Derived from a PNG that was uploaded to Pixabay by nutkitten
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
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
A repeatable image with dark background and metal grid pattern.
Source V. Hartikainen