I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
First pattern tailor-made for Retina, with many more to come. All the old ones are upscaled, in case you want to re-download.
Source Atle Mo
Remixed from a JPG that was uploaded to Pixabay by theasad121
Source Firkin
This pack of filters can help you adding a blocky overlay to objects. May come handy at drawing blocks of stone.
Source Lazur URH
Number 4 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
8 by 8 pixels, and just what the title says.
Source pixilated
A seamless pattern made from the gold Penrose triangle by GDJ and the two remixes
Source Firkin
A seamless pattern the starting point for which was a 'light rays' rendering in Paint.net.
Source Firkin
Inspired by a drawing in 'Kulturgeschichte', Freidrich Hellwald, 1896.
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Prismatic Hypnotic Pattern 2 No Background
Source GDJ
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
Small dots with minor circles spread across to form a nice mosaic.
Source John Burks
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
Zero CC tileable cork floor, photographed and made by me. CC0
Source Sojan Janso
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
Sharp diamond pattern. A small 24x18px tile.
Source Tom Neal
A seamlessly tileable pink background texture.
Source V. Hartikainen
Feel free to download this "Dark Wood" background texture for your web site. The background tiles seamlessly!
Source V. Hartikainen
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen