A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
This background has abstract texture with some similarities to wood.
Source V. Hartikainen
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Wasn't satisfied with the original's colouring. Too much component transfer and colormatrixes yet the results are lacking a bit. So this time it is a simple black to transparent fade, making it possible remixing easily once there will be other blending modes supported as well. Probably in inkscape 0.92.
Source Lazur URH
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
This is a semi-dark pattern, sort of linen-y.
Source Sagive SEO
Sometimes simple really is what you need, and this could fit you well.
Source Factorio.us Collective
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
The tile can be had by using shift+alt+i on the selected rectangle in Inkscape
Source Firkin
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
From a drawing in 'At home', J. Sowerby, J. Crane and T. Frederick, 1881.
Source Firkin
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
Zero CC tileable hard cover green book, scanned and made by me. CC0
Source Sojan Janso
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Prismatic Abstract Geometric Background 4
Source GDJ
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
Medium gray fabric pattern with 45-degree lines going across.
Source Atle Mo
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed