Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
Some more diagonal lines and noise, because you know you want it.
Source Atle Mo
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
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
This is the remix of "blue wave-seigaiha".The image depicts a seamless pattern of the front upper part of Japanese five yen coin which is used currently.This design represents a rice with ripe golden ears.
Source Yamachem
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
With a name this awesome, how can I go wrong?
Source Nikolay Boltachev
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
A cute x, if you need that sort of thing.
Source Juan Scrocchi
A background pattern with a look of rough fabric.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
Zero CC tileable Laminate wood texture, photographed and made by me. CC0
Source Sojan Janso
A heavy hitter at 400x400px, but lovely still.
Source Breezi
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
I have no idea how to describe this one, but it’s light and delicate.
Source JBasoo
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Prismatic Abstract Geometric Background 4
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin