Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
Basket Fibers, Basket Texture, Braid Background style CC0 texture.
Source 1A-Photoshop
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
A car pattern?! Can it be subtle? I say yes!
Source Radosław Rzepecki
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A yellow tiled background... Blurriness, bokeh effect and rectangles pattern in one mix.
Source V. Hartikainen
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Here's a quite bright pink background pattern for use on websites. It doesn't look like a real fur, but it definitely resembles one.
Source V. Hartikainen
You know you love wood patterns, so here’s one more.
Source Richard Tabor
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Seamless pattern formed from a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Abstract Ellipses Background Grayscale
Source GDJ
This is a seamless pattern of regular hexagon which has a honeycomb structure.
Source Yamachem
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Small gradient crosses inside 45-degree boxes, or bigger crosses if you will.
Source Wassim