Actually remixed from a pattern on Pixabay. But then noticed a very similar one on Openclipart.org uploaded by btj51q2.
Source Firkin
From a drawing in 'Cowdray: the history of a great English House', Julia Roundell, 1884.
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
Prismatic Abstract Geometric Background 4 No Black
Source GDJ
Sounds French. Some 3D square diagonals, that’s all you need to know.
Source Graphiste
Formed by heavily distorting part of a an image of a fish uploaded to Pixabay by GLady
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
A nice looking light gray background pattern with diagonal stripes.
Source V. Hartikainen
Prismatic Curved Diamond Pattern 5 No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Colour version of the original pattern.
Source Firkin
Prismatic Hexagonalist Pattern No Background
Source GDJ
Colorful Floral Background 3 No Black
Source GDJ
A cute x, if you need that sort of thing.
Source Juan Scrocchi
Prismatic Triangular Background Design Mark II 5
Source GDJ
Old China with a modern twist, take two.
Source Adam Charlts
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Floral patterns will never go out of style, so enjoy this one.
Source Lasma
Real snow that tiles, not easy. This is not perfect, but an attempt.
Source Atle Mo