This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Tweed is back in style – you heard it here first. Also, the @2X version here is great!
Source Simon Leo
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Prismatic Curved Diamond Pattern 8 No Background
Source GDJ
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
A nice one indeed, but I have a feeling we have it already? If you spot a copy, let me know on Twitter.
Source Graphiste
Inspired by an image that was uploaded to Pixabay by geralt
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ
As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
From a drawing in 'In an Enchanted Island', William Mallock, 1892.
Source Firkin
Inspired by a pattern I saw in a 19th century book. This seamless pattern was created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
ZeroCC tileable stone texture, edited from pixabay, CC0
Source Sojan Janso
Zero CC tileable Crackled Cement (streaks) texture, photographed and made by me. CC0
Source Sojan Janso
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
A seamless pattern created from a square tile. To get the tile, select the pattern in Inkscape and use shift+alt+i.
Source Firkin
Luxury pattern, looking like it came right out of Paris.
Source Daniel Beaton
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin