Become priminister/famous/take over the world
Most likely to end up in jail
Most likely to end up teaching at your school
Most likely to get married (straight and gay, but make sure they're ok with it)
Most likely to have a town/element/insect named after them
We had most fanciable male, most fanciable female, most caring, most hardworking, Prozac award for optimism, best dressed, most likely to be Prime Minister, funniest, best sportsman, best sportswoman and most likely to be rich and famous.
You might have to run them past a senior teacher at your school (we had to give the list to the head of pastoral care) because some of the ones which could be deemed offensive we were asked to remove. Some schools completely stay out of it though, so you could be okay.
Most Likely to be a Serial Killer
Most Likely to be a Millionnaire
Most Likely to be on the Dole
Sexiest Male Teacher
Sexiest Female Teacher
Best Male Teacher
Best Female Teacher
Your best bet is to pick your categories, see who wins...then if you're not sure if they'd take offence or not then go ask them if they mind - if they do then choose the person who came second as winner. Most people who've won ours are fine with it, but our "Sexiest Female" teacher refuses to have her photo taken (we've make a mock page in our yearbook which is the winners heads cut out and put onto funny pictures lol.