A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Black paper texture, based on two different images.
Source Atle Mo
Based from Design Kindle
A fun-looking elastoplast/band-aid pattern. A hint of orange tone in this one.
Source Josh Green
Abstract Ellipses Background Grayscale
Source GDJ
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
A seamlessly repeating background pattern of wood. The image is procedurally generated, and, I think, it's turned out quite well.
Source V. Hartikainen
One more in the line of patterns inspired by Japanese/Asian styles. Smooth.
Source Kim Ruddock
From a drawing in 'Resa i Afrika, genom Angola, Ovampo och Damaraland', P. Moller, 1899.
Source Firkin
Lovely pattern with some good-looking non-random noise lines.
Source Zucx
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A seamless web texture with illustration of pale color stains on canvas.
Source V. Hartikainen
Everyone loves a diamond, right? Make your site sparkle.
Source AJ Troxell
A pattern drawn in Paint.net and vectorized in Vector Magic.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin