A simple example on using clones. You can generate a nice base for a pattern fill quickly with it.
Source Lazur URH
This one is something special. I’d call it a flat pattern, too. Very well done, sir!
Source GetDiscount
Love me some light mesh on a Monday. Sharp.
Source Wilmotte Bastien
A repeating background with a look of paper. I have added some changes to PatCreator. Now you can share your designs by submitting them to a new gallery section. Start by clicking Edit with PatCreator above.
Source V. Hartikainen
To get the tile this is based on select the rectangle in Inkscape and use shift+alt+i.
Source Firkin
Colour version of the original pattern.
Source Firkin
Dark Tile-able Grunge Texture. I think this texture can be classified as grunge. It's free and seamless, as always.
Source V. Hartikainen
The square tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
A frame using leaves from an image that was uploaded to Pixabay by mayapujiati
Source Firkin
Dead simple but beautiful horizontal line pattern.
Source Fabian Schultz