As far as fabric patterns goes, this is quite crisp.
Source Heliodor Jalba
The first pattern on here using opacity. Try it on a site with a colored background, or even using mixed colors.
Source Nathan Spady
A web texture of brown canvas. Will look great, when used in dark web designs.
Source V. Hartikainen
Prismatic Curved Diamond Pattern No Background
Source GDJ
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
A seamless pattern from a tile drawn in Paint.net and vectorised in Vector Magic
Source Firkin
Seamless Green Tile Background
Source V. Hartikainen
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Remixed from a drawing in 'Hungary. A guide book. By several authors', 1890.
Source Firkin
Sometimes you just need the simplest thing.
Source Fabricio
Bigger is better, right? So here you have some large carbon fiber.
Source Factorio.us Collective
Bumps, highlight and shadows – all good things.
Source Badhon Ebrahim
A pattern formed from a squared tile. The tile can be accessed in Inkscape by selecting the rectangle and using shift-alt-i.
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Vector version of a png that was uploaded to Pixabay by pencilparker
Source Firkin
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
The name tells you it has curves. Oh yes, it does!
Source Peter Chon
More Japanese-inspired patterns, Gold Scales this time.
Source Josh Green
A seamless pattern from a tile made from a jpg on Pixabay. To get the tile select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Derived from elements found in a floral ornament drawing on Pixabay.
Source Firkin
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
A pale olive green background with a seamless texture.
Source V. Hartikainen
A re-make of the Gradient Squares pattern.
Source Dimitar Karaytchev