I think my favorite birthday cake ever was the rolled chocolate log cake I got from Baskin-Robbins. It had a hot fudge frosting that was to die for. The ice cream flavor was French vanilla and it had a few cherries on top.
The nice thing about an ice cream cake is that most kids love them. Unless they can't have dairy or gluten to start with, you can select nearly any flavor of cake and ice cream and end up with happy guests. If it satisfies the birthday boy or girl, chances are, the rest of the guests will like it, too.