Seamless pattern the basic tile for which can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
By popular request, an outline version of the pentagon pattern.
Source Atle Mo
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Formed by distorting a JPG from PublicDomainPictures
Source Firkin
Nothing like a clean set of bed sheets, huh?
Source Badhon Ebrahim
This could be a hippy vintage wallpaper.
Source Tileable Patterns
The perfect pattern for all your blogs about type, or type-related matters.
Source Atle Mo
A bit strange this one, but nice at the same time.
Source Diogo Silva
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Fake or not, it’s quite luxurious.
Source Factorio.us Collective
ZeroCC tileabel stone granite texture, edited from pixabay. CC0
Source Sojan Janso
Brushed aluminum, in a bright gray version. Lovely 2X as well.
Source Andre Schouten
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Plywood Web Background background image for use in web design.
Source V. Hartikainen
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Embossed lines and squares with subtle highlights.
Source Alex Parker
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Based on several public domain drawings on Wikimedia Commons. This was formed from a rectangular tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Pattern produced in Paint.net using the Vibrato plug-in.
Source Firkin