The name tells you it has curves. Oh yes, it does!
Source Peter Chon
This is the remix of "Background pattern 115" uploaded by "Firkin".Thanks.
Source Yamachem
A version without colours blended together to give a different look.
Source Firkin
A seamless background pattern with impressed gray dots.
Source V. Hartikainen
A seamlessly tileable pink background texture.
Source V. Hartikainen
Little x’es, noise and all the stuff you like. Dark like a Monday, with a hint of blue.
Source Tom McArdle
Prismatic Abstract Geometric Background 3
Source GDJ
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin
The edges of all the red objects line up either vertically or horizontally, but it doesn't appear so. Made from a square tile that can be got by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Because I love dark patterns, here is Brushed Alum in a dark coating.
Source Tim Ward
Light square grid pattern, great for a “DIY projects” sort of website, maybe?
Source Rafael Almeida
Inspired by a pattern found in 'Sun Pictures of the Norfolk Broads', Ernest Suffling, 1892.
Source Firkin