A seamless background colored in pale orange. It has a paper like texture with diagonal grid pattern.
Source V. Hartikainen
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Alternative colour scheme for the original floral pattern.
Source Firkin
Paper pattern with small dust particles and 45-degree strokes.
Source Atle Mo
This light blue background pattern is quite pleasing to the eye, it consists of a tiny rough grid pattern, which is seamless by design. That's it, if you like the color, you can use this seamless pattern in a web design without making any further modifications to it.
Source V. Hartikainen
Retro Circles Background 8 No Black
Source GDJ
This one is amazing, truly original. Go use it!
Source Viahorizon
Heavy depth and shadows here, but might work well on some mobile apps.
Source Damian Rivas
Prismatic Abstract Geometric Background 2 No Black
Source GDJ
Very dark pattern with some noise and 45-degree lines.
Source Stefan Aleksić
From a drawing in 'The Quiver of Love', Walter Crane, 1876
Source Firkin
Dark squares with some virus-looking dots in the grid.
Source Hugo Loning
Black version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Remixed from a vector adapted from a jpg on Pixabay. The tile this is constructed from can be had by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
If you’re sick of the fancy 3D, grunge and noisy patterns, take a look at this flat 2D brick wall.
Source Listvetra
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A free web background image with a seamless concrete-like texture and an Indian-red color.
Source V. Hartikainen
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Prismatic Hexagonalism Pattern No Background
Source GDJ
Prismatic Curved Diamond Pattern 3 No Background
Source GDJ
Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
Drawn in Paint.net and vectorised in Vector Magic
Source Firkin