Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
A seamless pattern created from a square tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
Oh yes, it happened! A pattern in full color.
Source Atle Mo
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
Black And White Floral Pattern Background Inverse
Source GDJ
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
A seamless marble-like texture colored in light blue.
Source V. Hartikainen
If you want png files of this u can download them here : viscious-speed.deviantart.com/gallery/27635117
Source Viscious-Speed
Sharp pixel pattern, just like the good old days.
Source Paridhi
White handmade paper pattern with small bumps.
Source Marquis
As the original image 's page size is too large for its image size, I remixed it.
Source Yamachem
Here's an yet another background for websites, with a seamless texture of wood planks this time.
Source V. Hartikainen
You just can’t get enough of the fabric patterns, so here is one more for your collection.
Source Krisp Designs
Used correctly, this could be nice. Used in a bad way, all hell will break loose.
Source Atle Mo
No relation to the band, but damn it’s subtle!
Source Thomas Myrman
This background pattern contains a seamless texture of bark. It's not very realistic, but I think it looks quite nice.
Source V. Hartikainen
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
This is indeed a bit strange, but here’s to the crazy ones!
Source Christopher Buecheler
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
Submitted in a cream color, but you know how I like it.
Source Devin Holmes
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
This one takes you back to math class. Classic mathematic board underlay.
Source Josh Green