This is sort of fresh, but still feels a bit old school.
Source Martuchox
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Neat little photography icon pattern.
Source Hossam Elbialy
One of the few full-color patterns here, but this one was just too good to pass up.
Source Alexey Usoltsev
An abstract pale yellow paper-like background with stains colored in yellow and green.
Source V. Hartikainen
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz
Almost like little fish shells, or dragon skin.
Source Graphiste
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Remixed from a drawing in 'Analecta Eboracensia', Thomas Widdrington, 1897.
Source Firkin
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
Source Firkin
Recreated from a pattern found in 'Az Osztrák-Magyar Monarchia irásban és képben', 1882. To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Not the most creative name, but it’s a good all-purpose light background.
Source Dmitry
A background pattern inspired by designs seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
The name is totally random, but hey, it sounds good.
Source Atle Mo
Number five from the same submitter, makes my job easy.
Source Dima Shiper