Many people keep their ping lists on their profile pages. If you look at mine, you'll see two ping lists way down at the bottom, past the babies.
This is (first) so that the list is convenient and accessible, and (second) so that other can use the list if they wish.
As far as protocol, it's not unusual for ping lists to have a colorful graphic. (This is beyond my html skills, though :-). You add people to the list if they ask, and take them off if they ask to be removed.
Nice pictures on your profile page. You have beautiful children!