This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Colourful background achieved with gradient fills.
Source Firkin
It almost looks a bit blurry, but then again, so are fishes.
Source Petr Šulc
CC0 and seamless wellington boot pattern.
Source SliverKnight
Detailed but still subtle and quite original. Lovely gray shades.
Source Kim Ruddock
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Remixed from a drawing in 'An Index to Deering's Nottinghamia Vetus et Nova', Rupert Chicken, 1899. The unit tile can be had by selecting the rectangle in Inkscape and using shift-alt-i
Source Firkin
Same as the black version, but now in shades of gray. Very subtle and fine grained.
Source Atle Mo
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
A pattern derived from repeating unit cells each derived from part of a mosaic in paint.net. The starting point for the mosaic was a picture of some prawns!
Source Firkin
The name alone is awesome, but so is this sweet dark pattern.
Source Federica Pelzel
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso