The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
Fix and cc0 to get the tile this is based on.
Source SliverKnight
This one could be the shirt of a golf player. Angled lines in different thicknesses.
Source Olivier Pineda
Psychedelic Geometric Background No Black
Source GDJ
Clover with background for St. Patrick's Day. Add to a card with a doily, ribbon, a leprechaun or other embellishments.
Source BAJ
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
This background pattern contains a texture of yellow wood planks. I think it looks quite original.
Source V. Hartikainen
Embossed lines and squares with subtle highlights.
Source Alex Parker
From an image on opengameart.org shared by rubberduck.
Source Firkin
A seamless light gray paper texture with horizontal double lines.
Source V. Hartikainen
Fix and cc0 to get the tile this is based on.
Source SliverKnight
A huge one at 800x600px. Made from a photo I took going home after work.
Source Atle Mo
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A bit like smudged paint or some sort of steel, here is scribble light.
Source Tegan Male
Super dark, crisp and detailed. And a Kill Bill reference.
Source Badhon Ebrahim
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
This was formed by distorting an image of a background on Pixabay.
Source Firkin
A seamless dark leather-like background texture with diagonal lines that look like stitches.
Source V. Hartikainen
A seamless pattern recreated from an image on Pixabay. It is reminiscent of parquet flooring and is formed from a square tile, which can be recovered in Inkscape by selecting the ungrouped rectangle and using shift-alt-I together.
Source Firkin
Honestly, who does not like a little pipe and mustache?
Source Luca Errico