A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
All good things come in threes, so I give you the third in my little concrete wall series.
Source Atle Mo
Prismatic Snowflakes Pattern 2 No Background
Source GDJ
Sounds like something from World of Warcraft. Has to be good.
Source Tony Kinard
Prismatic Polka Dots Mark II 2 No Background
Source GDJ
If you like it a bit trippy, this wave pattern might be for you.
Source Ian Soper
Prismatic Geometric Tessellation Pattern No Background
Source GDJ
A light brushed aluminum pattern for your pleasure.
Source Tim Ward
Inspired by the B&O Play, I had to make this pattern.
Source Atle Mo
More leather, and this time it’s bigger! You know, in case you need that.
Source Elemis
There are quite a few grid patterns, but this one is a super tiny grid with some dust for good measure.
Source Dominik Kiss
The basic shapes never get old. Simple triangle pattern.
Source Atle Mo
Prismatic Groovy Concentric Background 2 No Black
Source GDJ
The original enhanced with some gradients.
Source Firkin
A seamless pattern formed from a modified version of rwwgub's tile. To get the tile, select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Light gray pattern with an almost wall tile-like appearance.
Source Markus Tinner
Drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
From a tile that can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
Prismatic Groovy Concentric Background No Black
Source GDJ
Seamless pattern the tile for which can be had by using shift-alt-I on the selected rectangle in Inkscape.
Source Firkin
Prismatic Groovy Concentric Background 4
Source GDJ