Over the past we year we have had a few enquiries about how to add icons to family types within Family Browser. This is most commonly asked when a family has totally different geometry per type within the family. Revit can’t do it and we can’t generate an image from the API for this. There has been a recent discussion over at RFO - Link Here, discussing this very topic.
Well the good news is that within Family Browser we can now do this. You will need to download the currunt release of Family Browser/Project Browser from our products page for this to work.