This could be a hippy vintage wallpaper.
Source Tileable Patterns
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Found on the ground in french cafe in kunming, Yunnan, china
Source Rejon
The image a seamless pattern of a wire-mesh fence.I want you to use this pattern as a lower layer.
Source Yamachem
Pattern formed from simple shapes. Black version.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
A floral background formed from numerous clones of flower 117.
Source Firkin
Not sure if this is related to the Nami you get in Google image search, but hey, it’s nice!
Source Dertig Media
Prismatic Triangular Background Design Mark II 5
Source GDJ
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Prismatic Floral Background No Black
Source GDJ
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Seamless pattern formed from a tile that 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
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady