Graduation Gift for Big brothers Girlfriend!?

My brother and his girlfriend have been dating for like 3 years and are grauating high school! I already got my brother a gift but i want to get ong for her too! I want to make her somthing homemade so it is from the heart and i want it to be special. I live accross the world from them (Military) so i cant get somthing that everyone can sign or whatever! So I need ideas and sooN!