This could be a hippy vintage wallpaper.
Source Tileable Patterns
Here's a brown background pattern with subtle stripes. I hope you'll like the color. If not, feel free to change it using an image editor, if you know how of course. Personally, I'm using GIMP to create these backgrounds.
Source V. Hartikainen
Don’t look at this one too long if you’re high on something.
Source Luuk van Baars
A monochrome pattern from a tile that can be had by selecting the rectangle in Inkscaope and using shift+alt+i
Source Firkin
Prismatic Curved Diamond Pattern 6 No Background
Source GDJ
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Prismatic Groovy Concentric Background 5 No Black
Source GDJ
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
A simple circle. That’s all it takes. This one is even transparent, for those who like that.
Source Saqib
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Prismatic Geometric Pattern Background
Source GDJ
Same classic 45-degree pattern, dark version.
Source Luke McDonald
White fabric looking texture with some nice random wave features.
Source Hendrik Lammers
Continuing the geometric trend, here is one more.
Source Mike Warner
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
From a drawing in 'Jardyne's Wife', Charles Wills, 1891.
Source Firkin
This reminds me of Game Cube. A nice light 3D cube pattern.
Source Sander Ottens
Prismatic Curved Diamond Pattern 4 No Background
Source GDJ
You were craving more leather, so I whipped this up by scanning a leather jacket.
Source Atle Mo
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Studies for Stories', Jean Ingelow, 1864.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Same as gray sand but lighter. A sandy pattern with small light dots, and some angled strokes.
Source Atle Mo
Dark blue concrete wall with some small dust spots.
Source Atle Mo