Zero CC tileable pine bark texture, photographed and made by me. CC0
Source Sojan Janso
Number five from the same submitter, makes my job easy.
Source Dima Shiper
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Alternative colour scheme for the original floral pattern.
Source Firkin
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Prismatic Abstract Geometric Background 4
Source GDJ
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
A seamless pattern formed from a sports car on clker.com. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Prismatic Groovy Concentric Background 4
Source GDJ
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Based on an image that was uploaded to Pixabay by devanath
Source Firkin
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'Paul's Sister', Frances Peard, 1889.
Source Firkin