A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Prismatic Polka Dots Mark II No Background
Source GDJ
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo
A pattern derived from repeating unit cells each derived from part of a fractal rendering in paint.net.
Source Firkin
Colourful background achieved with gradient fills.
Source Firkin
This one is rather fun and playful. The 2X could be used at 1X too!
Source Welsley
Seamless , tileable CC-0 texture. Created by my own, feel free to use wherever you want!
Source Linolafett
Seamless Prismatic Geometric Pattern With Background
Source GDJ
Derived from an image that was uploaded to Pixabay by TheDigitalArtist
Source Firkin
Crossing lines with a subtle emboss effect on a dark background.
Source Stefan Aleksić
Just to prove my point, here is a slightly modified dark version.
Source Atle Mo
A seamless pattern drawn originally in Paint.net by distorting a slice of background pattern 116 and copying the resulting triangle numerous times.
Source Firkin
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Number 1 in a series of 5 beautiful patterns. Can be found in colors on the submitter’s website.
Source Janos Koos
Seamless pattern inspired by a drawing on Pixabay. To get the tile this is formed from, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Background Wall, Art Abstract, Blue Well & CC0 texture.
Source Ractapopulous
Remixed from an image that was uploaded to Pixabay by Pixeline
Source Firkin
Feel free to use this seamless background texture as a background on a web site. It's colored in a light pink color and is seamlessly tile-able.
Source V. Hartikainen
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Floral patterns might not be the hottest thing right now, but you never know when you need it!
Source Lauren
One more brick pattern. A bit more depth to this one.
Source Benjamin Ward