Zerro CC tillable texture of stones photographed and made by me. CC0
Source Sojan Janso
A playful triangle pattern with different shades of gray.
Source Dimitrie Hoekstra
Colorful Floral Background No Black
Source GDJ
Remixed from a design seen on Pixabay. The basic tile can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A background formed from an image of an old tile on the New York Metropolitan Museum of Art website. To get the base tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
Lovely light gray floral motif with some subtle shades.
Source GraphicsWall
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
Prismatic Chevrons Pattern 5 With Background
Source GDJ
Dark, crisp and subtle. Tiny black lines on top of some noise.
Source Wilmotte Bastien
Prismatic Hexagonalist Pattern No Background
Source GDJ
Continuing the geometric trend, here is one more.
Source Mike Warner
Sometimes you just need the simplest thing.
Source Fabricio
A grid of squares with green colours. Since the colours are randomly distributed it is automatically seamless.
Source Firkin
Abstract Tiled Background Extended 8
Source GDJ
Super simple but very nice indeed. Gray with vertical stripes.
Source Merrin Macleod
A seamless pattern the starting point for which was a 'rainbow twist' texture in Paint.net.
Source Firkin
Derived from a drawing in 'The Murmur of the Shells', Samuel Cowen, 1879.
Source Firkin
Just like your old suit, all striped and smooth.
Source Alex Berkowitz
From a drawing in 'Art Embroidery', M.S. Lockwood and E. Glaister, 1878.
Source Firkin