If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Inspired by a drawing seen in 'City of Liverpool', James Picton, 1883.
Source Firkin
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A seamlessly tile-able grunge background image.
Source V. Hartikainen
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
Light gray version of the Binding pattern that looks a bit like fabric.
Source Newbury
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Hey, you never know when you’ll need a bird pattern, right?
Source Pete Fecteau
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Prismatic Polka Dots Mark II No Background
Source GDJ
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
To get the tile this is made up from select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Very simple, very blu(e). Subtle and nice.
Source Seb Jachec
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
This could be a hippy vintage wallpaper.
Source Tileable Patterns
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin
Remixed from a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
Pattern #100! A black classic knit-looking pattern.
Source Factorio.us Collective