looking for ideas

Hi, i am new here so bear with me. Here it goes. I was asked to decorate a cake for a teacher that is leaving our Christian School and even tho i have decorated birthday cakes that is as far as i've gone. I have no idea's on what to do or how to do it. I am looking for suggestions of all kinds. I do know 2 things..lol It is for a male teacher at a christian school and i will be making 2- 9x13 cakes. thank you in advance for your help.