Lovely pattern with some good-looking non-random noise lines.
Source Zucx
Adapted heavily from a JPG that was uploaded to Pixabay by Viscious-Speed.
Source Firkin
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
Prismatic Abstract Background Design No Black
Source GDJ
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
White handmade paper pattern with small bumps.
Source Marquis
Tiny circle waves, almost like the ocean.
Source Sagive
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
It’s a hole, in a pattern. On your website. Dig it!
Source Josh Green
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
A subtle shadowed checkered pattern. Increase the lightness for even more subtle sexiness.
Source Josh Green
Here's a camo print with more tan and less green, such as might be used in a desert scenario. This is tileable, so it can be used as a wallpaper or background.
Source Eady
Bright gray tones with a hint of some metal surface.
Source Hendrik Lammers
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Sort of like the Photoshop transparent background, but better!
Source Alex Parker
Remixed from a drawing in 'Jezebel's Daughter', Wilkie Collins 1880
Source Firkin
Colorful Floral Background 3 No Black
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin