Tile available in Inkscape using shift-alt-i on the selected rectangle
Source Firkin
This is the remix of "Tileable Wave Pattern 2" uploaded by "Arvin61r58".Thanks.I added a wire-mesh fence seamless pattern as a lower layer.
Source Yamachem
This is a hot one. Small, sharp and unique.
Source GraphicsWall
Retro Circles Background 4 No Black
Source GDJ
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
From a drawing in 'Artists and Arabs', Henry Blackburn, 1868
Source Firkin
Imagine you zoomed in 1000X on some fabric. But then it turned out to be a skeleton!
Source Angelica
More in the paper realm, this time with fibers.
Source Jorge Fuentes
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
Used in small doses, this could be a nice subtle pattern. Used on a large surface, it’s dirty!
Source Paul Reulat
Got some felt in my mailbox today, so I scanned it for you to use.
Source Atle Mo
Prismatic Hexagonalist Pattern No Background
Source GDJ
Redrawn based on a drawing in 'По Сѣверо-Западу Россіи' Konstantin Sluchevsky, 1897.
Source Firkin
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
Like the name says, light and gray, with some small dots and circles.
Source Brenda Lay
The classic 45-degree diagonal line pattern, done right.
Source Jorick van Hees
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
Same classic 45-degree pattern, dark version.
Source Luke McDonald
A version without colours blended together to give a different look.
Source Firkin
A comeback for you: the popular Escheresque, now in black.
Source Patten
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
A background pattern with green vertical stripes. A new striped background pattern. This time a green one.
Source V. Hartikainen
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
Formed from a tile based on a drawing from 'Viaggi d'un artista nell'America Meridionale', Guido Boggiani, 1895.
Source Firkin
A seamless texture traced from an image on opengameart.org shared by Scouser.
Source Firkin
A seamless gray background texture suitable for use on websites. To me, it has the look of stone. Feel free to modify it to meet your needs (by making it a bit lighter or darker, for example).
Source V. Hartikainen