The following repeating website background is colored in a blue gray color and resembles a concrete wall or something similar to it.
Source V. Hartikainen
Neat little photography icon pattern.
Source Hossam Elbialy
Light honeycomb pattern made up of the classic hexagon shape.
Source Federica Pelzel
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Black brick wall pattern. Brick your site up!
Source Alex Parker
Abstract Tiled Background Extended 10
Source GDJ
Semi-light fabric pattern made out of random pixels in shades of gray.
Source Atle Mo
Carbon fiber is never out of fashion, so here is one more style for you.
Source Alfred Lee
The image depicts an edo-era pattern called "same-komon" or "鮫小紋"which looks like a shark skin.The "same" in Japanese means shark in English.
Source Yamachem
Nasty or not, it’s a nice pattern that tiles. Like they all do.
Source Badhon Ebrahim
Utilising some flowers from Almeidah. To get the unit tile, select the rectangle in Inkscape and use shift-alt-i.
Source Firkin
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
The tile this is based on can be retrieved by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
The green fibers pattern will work very well in grayscale as well.
Source Matteo Di Capua
One more sharp little tile for you. Subtle circles this time.
Source Blunia
More tactile goodness. This time in the form of some rough cloth.
Source Bartosz Kaszubowski
Prismatic Geometric Tessellation Pattern 2 No Background
Source GDJ
ZeroCC tileable mossy (lichen) stone texture, edited from pixabay. CC0
Source Sojan Janso
Prismatic Abstract Geometric Background 3
Source GDJ
Fix side and a seamless pattern formed from circles.
Source SliverKnight
The tile can be had by selecting the rectangle in Inkscape and using shift+alt+i. Remixed from a drawing in 'Flowers of Song', Frederick Weatherly, 1895.
Source Firkin
New paper pattern with a slightly organic feel to it, using some thin threads.
Source Atle Mo