CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Awesome name, great pattern. Who does not love space?
Source Nick Batchelor
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Dark wooden pattern, given the subtle treatment. based on texture from Cloaks. https://cloaks.deviantart.com
Source Atle Mo
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
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
Prismatic Groovy Concentric Background 3
Source GDJ
Honestly, who does not like a little pipe and mustache?
Source Luca Errico
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
You know, tiny and sharp. I’m sure you’ll find a use for it.
Source Atle Mo
"Beige Stone", Tileable Texture.
Source V. Hartikainen
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
A topographic map like this has actually been requested a few times, so here you go!
Source Sam Feyaerts
The image depicts a seamless pattern of pine tree leaves.
Source Yamachem
Prismatic Groovy Concentric Background
Source GDJ