How about something motivational for the students?
veni, vidi, vici is a famous latin phrase by Julius Caesar and means I came, I saw, I conquered.
Some university mottos are:
Sapientia et doctrina. ("Wisdom and knowledge.")
Veritas vos liberabit. ("Truth will free you.")
Lux sit. ("Let there be light.")
Respice, adspice, prospice. ("Look back, look to the present, look to the future.")
Lux et veritas. ("Light and truth.")
Nil sine magno labore. ("Nothing without great effort.")
Lots of Latin out there! Have fun (I loved Latin class in HS!! :D )