Light gray grunge wall with a nice texture overlay.
Source Adam Anlauf
Element of beach pattern with background.
Source Rones
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Prismatic Polka Dots Mark II 3 No Background
Source GDJ
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
CC0 and a seamless pattern from a tile drawn in Paint.net .
Source SliverKnight
Background pattern made in "Grunge-Like" style. Available in both SVG and JPG formats. Edit to your needs then click the download button.
Source V. Hartikainen
Prismatic Abstract Geometric Background 4
Source GDJ
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
A background pattern with blue on white vertical stripes.
Source V. Hartikainen
From a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
From a drawing in 'Codogno e il suo territorio nella cronaca e nella storia'', Gio and Giarella Cairo, 1897.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A slightly more textured pattern, medium gray. A bit like a potato sack?
Source Bilal Ketab
Formed from decorative divider 184 in paint.net. Vectorised with Vector Magic.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Prismatic Geometric Pattern Background No Black
Source GDJ