I've seen some icons with a heart in the corner of the standard profile picture.

I've taken this one step further, because I like photos when possible: I added a small heart to the bottom right corner (using Picnik.com) and put "Direct Line" in the comments for the photo. For those I don't have photos, I'm going to use something like the coat of arms with the heart.

I have made sure to include a "standard" photo in my media gallery for the person, so if someone wants to include my Direct Line in their tree, they can choose that photo.

<3