A pattern drawn in Paint.net and vectorized in Inkscape.
Source Firkin
A bit simplified version. Although it could be edited out to be simpler. Anyway, this time the tiling is converted to a pattern fill -which is using clipping for the tile's edges.
Source Lazur URH
Prismatic Abstract Geometric Background 5 No Black
Source GDJ
One more sharp little tile for you. Subtle circles this time.
Source Blunia
Inspired by a 1930s wallpaper pattern I saw on TV.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
Three shades of gray makes this pattern look like a small carbon fiber surface. Great readability even for small fonts.
Source Atle Mo
Prismatic Abstract Geometric Background 2
Source GDJ
Derived from an image that was uploaded to Pixabay by Kaz
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Retro Circles Background 4 No Black
Source GDJ
Prismatic Floral Background No Black
Source GDJ
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
Used the 6th circle pattern designed by Viscious-Speed to create a print that can be used for card making or scrapbooking. Save as a PDF file for the best printing option.
Source Lovinglf