The image depicts a seamless pattern of a tortoise in tortoiseshell (hexagon).
Source Yamachem
Retro Circles Background 7 No Black
Source GDJ
Prismatic Floral Pattern 3 Variation 3 No Background
Source GDJ
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Here's a tile-able wood background image for use in web design.
Source V. Hartikainen
The original enhanced with one of Inkscapes's filters.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
This is sort of fresh, but still feels a bit old school.
Source Martuchox
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
The image depicts a Japanese Edo pattern called "kanoko or 鹿の子" meaning "fawn" which has a fur with small white spots.
Source Yamachem
From a drawing in 'Less Black than we're painted', James Payn, 1884.
Source Firkin
Zero CC tileable dry grass texture, photographed and made by me. CC0
Source Sojan Janso
Seamless Olive Green Web Background Image
Source V. Hartikainen
Prismatic Hexagonalism Pattern No Background
Source GDJ
Prismatic Floral Background No Black
Source GDJ