This pattern comes in orange, and it looks as if it is "made of glass".
Source V. Hartikainen
This was formed by distorting an image of a background on Pixabay.
Source Firkin
You know you can’t get enough of these linen-fabric-y patterns.
Source James Basoo
You don’t see many mid-tone patterns here, but this one is nice.
Source Joel Klein
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Alternative colour scheme for the original floral pattern.
Source Firkin
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Turn your site into a dragon with this great scale pattern.
Source Alex Parker
From a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
The classic subtle pattern. Sort of wall/brick looking. Or moon-looking?
Source Joel Klein
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
This one looks like a cork panel. Feel free to use it as a tiled background on your blog or website.
Source V. Hartikainen
Stefan is hard at work, this time with a funky pattern of squares.
Source Stefan Aleksić
From a drawing in 'Danmarks Riges Historie af J. Steenstrup, Kr. Erslev, A. Heise, V. Mollerup, J. A. Fridericia, E. Holm, A. D. Jørgensen', 1897.
Source Firkin
Dark, square, clean and tidy. What more can you ask for?
Source Jaromír Kavan
Kaleidoscope Prismatic Abstract No Background
Source GDJ
Prismatic Rounded Squares Grid 3 No Background
Source GDJ