U.S.-based National Fire Protection Association standard fire diamond for flagging risks posed by hazardous materials. The red diamond has a number 0-4 depending on flammability. The blue diamond has a number 0-4 depending on health hazard. The yellow has a number 0-4 depending on reactivity. the white square has a special notice, e.g OX for oxidizer.
Source Firkin
A simple but elegant classic. Every collection needs one of these.
Source Christopher Burton
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
This is lovely, just the right amount of subtle noise, lines and textures.
Source Richard Tabor
Your eyes can trip a bit from looking at this – use it wisely.
Source Michal Chovanec
To get the tile this is based on, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
This is a more minute version of "fishnet 01".The image depicts a seamless pattern of a fishnet with a plenty of fish.It may be a lucky charm for fishermen.
Source Yamachem
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Bit of a strange name on this one, but still nice. Tiny gray square things.
Source Carlos Valdez
To get the tile this is based on select the rectangle in Inkscape and use shift-alt-i
Source Firkin
Light and tiny, just the way you like it.
Source Rohit Arun Rao
A large (588x375px) sand-colored pattern for your ever-growing collection. Shrink at will.
Source Alex Tapein
I skipped number 3, because it wasn’t all that great. Sorry.
Source Dima Shiper
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman
The unit cell for this seamless pattern can be had in Inkscape by selecting the rectangle and using shift+alt+i.
Source Firkin
A repeating background with dark brown stone-like texture and abstract pattern that looks like tree trunks.
Source V. Hartikainen
A lovely light gray pattern with stripes and a dash of noise.
Source V. Hartikainen
This light background pattern has a texture of "frozen" surface with diagonal stripes. Here's an yet another addition to the collection of free website backgrounds.
Source V. Hartikainen
On a large canvas you can see it tiling, but used on smaller areas, it’s beautiful.
Source Paul Phönixweiß
This is a remix of "flower seamless pattern".I rotated the original image by 90 degrees.This is a seamless pattern of flowers.These horizontal wavy lines are one of Edo patterns which is called "tatewaku or tachiwaku or 立湧" that represents uprising steam or vapor.
Source Yamachem
Never out of fashion and so much hotter than the 45º everyone knows, here is a sweet 60º line pattern.
Source Atle Mo
Formed by distorting a JPG from PublicDomainPictures
Source Firkin