A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
This ons is quite old school looking. Retro, even. I like it.
Source Arno Declercq
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
Made by distorting a simple pattern using the 'sin waves' plugin for Paint.net and vectorising in Vector Magic
Source Firkin
Remixed from a drawing in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Could be paper, could be a Polaroid frame – up to you!
Source Chaos
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I.
Source Firkin
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Fabric-ish patterns are close to my heart. French Stucco to the rescue.
Source Christopher Buecheler
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
A very slick dark rubber grip pattern, sort of like the grip on a camera.
Source Sinisha
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
Nicely executed tiling for an interesting pattern.
Source Ignasi Àvila Padró
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green
emixed from a JPG that was uploaded to Pixabay by Kyotime
Source Firkin
A version without colours blended together to give a different look.
Source Firkin
From a drawing in 'Chambéry à la fin du XIVe siècle', Timoleon Chapperon, 1863.
Source Firkin