The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
After 1 comes 2, same but different. You get the idea.
Source Hendrik Lammers
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
This one is super crisp at 2X. Lined paper with some dust and scratches.
Source HQvectors
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A free pink background pattern.
Source V. Hartikainen
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
You could get a bit dizzy from this one, but it might come in handy.
Source Dertig Media
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A seamless pattern the unit cell for which can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
A free green background pattern with a pattern of rhombuses on a seamless texture. Feel free to use it as a tiled background image on your web site.
Source V. Hartikainen
Zero CC tileable yellow craft paper; scanned and made by me. CC0
Source Sojan Janso
Mostly just mucked about with the colours and made one of the paths in the lead frame opaque. The glass remains transparent.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Zero CC tileable hard cover cells, skin like, book texture. 4K, Scanned and made by me CC0
Source Sojan Janso
Fix side and a seamless pattern formed from circles.
Source SliverKnight
Prismatic Geometric Pattern Background 2
Source GDJ