As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
Prismatic Triangular Seamless Pattern III With Background
Source GDJ
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857.
Source Firkin
If you need a green background for your blog/website, try this one. Remember that Green Striped Background is seamlessly tileable.
Source V. Hartikainen
Same classic 45-degree pattern, dark version.
Source Luke McDonald
Zero CC tileable wood texture, made by me procedurally in Neo Texture Edit.
Source Sojan Janso
Submitted as a black pattern, I made it light and a few steps more subtle.
Source Andy
A pattern formed from repeated instances of corner decoration 8. To get the basic tile select the rectangle in Inkscape and use shift+alt+i
Source Firkin
A free seamless background image with a texture of dark red "canvas". It should look very nice on web sites.
Source V. Hartikainen
Colour version of the original seamless pattern.
Source Firkin
Sharp pixel pattern looking like some sort of fabric.
Source Dmitry
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
Sort of like the back of a wooden board. Light, subtle, and stylish, just the way we like it!
Source Nikolalek
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
One more from Badhon, sharp horizontal lines making an embossed paper feeling.
Source Badhon Ebrahim
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The image depicts a seamless pattern of the design which includes a stylized lotus and a stylized crane.I referred to the original image in a book which is into public domain.
Source Yamachem
An alternative colour scheme for the original background.
Source Firkin
A seamless web background with texture of aged grid paper.
Source V. Hartikainen
Clean and crisp lines all over the place. Wrap it up with this one.
Source Dax Kieran
Gold Triangular Seamless Pattern No Background
Source GDJ