Non-seamless pattern drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Remixed from a drawing in 'Canadian forest industries July-December', 1915
Source Firkin
The image is a design of blue glass.How about using it as background image?
Source Yamachem
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Derived from a PNG that was uploaded to Pixabay by nutkitten
Source Firkin
A very dark spotted twinkle pattern for your twinkle needs.
Source Badhon Ebrahim
A colourful background drawn originally in paint.net and vectorised in Vector Magic.
Source Firkin
A brown seamless wood texture in a form of stripe pattern. The result has turned out pretty well, in my opinion.
Source V. Hartikainen
Colorful Floral Background 3 No Black
Source GDJ
This is the remix of "Strawberry Pattern Background" uploaded by "GDJ". Thanks. I realigned strawberries so as to get seamless and changed the BG color.
Source Yamachem
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
An emulated “transparent” background pattern, like that of all kinds of computer graphics software.
Source AdamStanislav
Sometimes you just need the simplest thing.
Source Fabricio
With a name like this, it has to be hot. Diagonal lines in light shades.
Source Isaac
Not a pattern for fabrics, but one produced from a jpg of a stack of fabric items that was posted on Pixabay. The tile that this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
I have no idea what J Boo means by this name, but hey – it’s hot.
Source j Boo
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
White circles connecting on a light gray background.
Source Mark Collins
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-I. A version of the original with random colors.
Source Firkin
The image depicts meshed silhouettes of various things.The original image is an OCAL clipart called "Enter FOSSASIA 2016 #IoT T-shirt Design Contest" uploaded by "openclipart".Thanks.
Source Yamachem
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Dare I call this a «flat pattern»? Probably not.
Source Dax Kieran
A seamless textured paper for backgrounds. Colored in pale orange hues.
Source V. Hartikainen