I created a custom north arrow in Inkscape, now I cannot seem to add it to ArGIS 10.1. I would ideally like for it to be displayed in the north arrow selector window (See attached image). How can I add my custom north arrow to ArcMap 10.1?

I created a custom north arrow in Inkscape, now I cannot seem to add it to ArGIS 10.1. I would ideally like for it to be displayed in the north arrow selector window (See attached image). How can I add my custom north arrow to ArcMap 10.1?

You can add your own custom North Arrow via the Style Manager

http://resources.arcgis.com/en/help/main/10.1/index.html#//00s600000008000000
Your image needs to be in EMF format