How to make Google Maps with Custom Maps

For my project, I will need to make use of a custom Google map in which communities and landmarks will be highlighted uniquely (examples can be seen here: http://www.google.ca/earth/outreach/tutorials/custommaps.html).

Is there a way to make the Google Map plugin use my custom map instead of the default one Google provides? I looked in the Add-Ons section for the plugin, but nothing really jumped out at me.