Prismatic Hexagonalism Pattern No Background
Source GDJ
Not so subtle. These tileable wood patterns are very useful.
Source Elemis
Background Wall, Art Abstract, Block Well & CC0 texture.
Source Ractapopulous
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
Like the name suggests, this background image consists of a pattern of dark bricks. It may be an option for you, if you are looking for something that looks like a brick wall for use as a background on web pages. It's not a masterpiece, but looks pretty nice when is tiled.
Source V. Hartikainen
This background pattern looks like bamboo to me. Feel free to download it for your website (for your blog perhaps?).
Source V. Hartikainen
Just like the black maze, only in light gray. Duh.
Source Peax
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
A seamless chequerboard pattern formed from a tile that can be had in Inkscape by selecting the rectangle and using shift+alt+i. Alternative colour scheme.
Source Firkin
From a drawing in 'Friend or Fortune? The story of a strange year', Robert Overton, 1897.
Source Firkin
From a design found in 'History of the Virginia Company of London; with letters to and from the first Colony, never before printed', Edward Neill, 1869.
Source Firkin
Background formed from the original with an emboss effect
Source GDJ
White little knobs, coming in at 10x10px. Sweet!
Source Amos
Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
From a drawing in 'Uit de geschiedenis der Heilige Stede te Amsterdam', Yohannes Sterck, 1898.
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
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamlessly tile-able grunge background image.
Source V. Hartikainen
Orange-red pattern for tiled backgrounds.
Source V. Hartikainen