I have uploaded a base icon svg to github: sfos-baseicon

You can change the clipped corners by adding/removing classes to the svg element (text editor or inkscape).
An example how to create .png files with different sizes from an svg with inkscape on linux easily is included in the readme.

The dimensions have been taken from the SFOS example svg, so it's 86px with that "0.3px" padding.

It might not be for everyone, but if it helps someone else but me… it's already worth it.

cheers!