Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
CC0 and seamless wellington boot pattern.
Source SliverKnight
From a drawing in 'Les Chroniqueurs de l'Histoire de France depuis les origines jusqu'au XVIe siècle', Henriette Witt, 1884.
Source Firkin
This seamless background image should look nice on websites. It has a dark blue gray texture with vertical stripes, it tiles seamlessly and, like all of the background images here, it's free. So, if you like it, take it!
Source V. Hartikainen
Light and tiny, just the way you like it.
Source Rohit Arun Rao
Prismatic Rounded Squares Grid 4 No Background
Source GDJ
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
A good starting point for a cardboard pattern. This would work well in a variety of colors.
Source Atle Mo
Thin lines, noise and texture creates this crisp dark denim pattern.
Source Marco Slooten
Classic vertical lines, in all its subtlety.
Source Cody L
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
A seamless pattern based on a square tile that can be retrieved in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
The tile this fill pattern is based on can be had by using shift+alt+i on the rectangle.
Source Firkin
Uses spirals from Pixabay. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
The image depicts a seamless pattern which includes hexagonally-aligned gourds with BG in light-brown.
Source Yamachem
It’s okay to be square! A nice light gray pattern with random squares.
Source Waseem Dahman