This is so subtle you need to bring your magnifier!
Source Carlos Valdez
Prismatic Floral Background No Black
Source GDJ
Simple wide squares with a small indent. Fits all.
Source Petr Šulc.
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Pixel by pixel, sharp and clean. Very light pattern with clear lines.
Source M.Ashok
Nicely crafted paper pattern, although a bit on the large side (500x593px).
Source Blaq Annabiosis
Colour version of the original pattern.
Source Firkin
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
A blue background wallpaper for websites. It has a seamless texture with vertical stripes. It looks quite nice not only when using as a tiled background on websites, but also on computer desktops.
Source V. Hartikainen
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
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
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
Background formed from the original with an emboss effect.
Source Firkin
A dark pattern made out of 3×3 circles and a 1px shadow. This works well as a carbon texture or background.
Source Atle Mo
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
You know I’m a sucker for these. Well-crafted paper pattern.
Source Mihaela Hinayon
A free light orange brown wallpaper with vertical stripes designed for use as a tiled background on websites. An yet another background pattern with vertical stripes.
Source V. Hartikainen
Prismatic Groovy Concentric Background 4
Source GDJ
White little knobs, coming in at 10x10px. Sweet!
Source Amos
A version without colours blended together to give a different look.
Source Firkin
Paper model of a tetrahedron. Modelo de papel de um tetraedro.
Source laobc
To get the tile this is based on, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Adapted from an image that was uploaded to Pixabay by Anerma.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo