This ladies and gentlemen, is texturetastic! Love it.
Source Adam Pickering
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
The classic notebook paper with horizontal stripes.
Source Are Sundnes
A pale olive green background with a seamless texture.
Source V. Hartikainen
A slightly grainy paper pattern with small horizontal and vertical strokes.
Source Atle Mo
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Inspired by a design found in 'Konstantinápolyi emlékeim', Miklos Chriszto, 1893.
Source Firkin
Sharp pixel pattern, just like the good old days.
Source Paridhi
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Could remind you a bit of those squares in Super Mario Bros, yeh?
Source Jeff Wall
This was formed by distorting an image of a background on Pixabay.
Source Firkin
Nice and simple crossed lines in dark gray tones.
Source Stefan Aleksić
Prismatic Abstract Line Art Pattern Background
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless stone-like background for blogs or any other type of websites.
Source V. Hartikainen
Dark and hard, just the way we like it. Embossed triangles makes a nice pattern.
Source Ivan Ginev
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin