What do i write in my friend's yearbooks?

I'm in 7th grade, but i want to write something special in everyone of my friends yearbook's. I'm going to write something different in each one, but I don't have a clue what to write for some of my friends. I want to write something in my boyfriends, but i dont want it to sound too cheesy. I also want to write something good in my best friends books. I don't want something like "HAGS" or "call me" or just come out and say "you're awesome! i love u".....plz help!