Back in 1984...  
... when I was completing high school.... 
The annual tradition was to have what we called a 
"Matric Farewell Dance" and a "Matric Banquet"
The dance was our final year dance to which boyfriends, friends, blind dates, etc were invited
The banquet was a more formal event for only students and their parents
In both cases, the Std 9 (or grade 11) students did the decor and planning for the event
Our banquet theme was fantasy and each Matriculant received a personalized scroll

This is mine....

That was not the end of the story though. It was a brilliant help with finding a name that wasn't already used in my earlier Yahoo days. Tintalasia became my ID, but a little long for regular use, so my friends... the Gyms... nicknamed me Tint and it stuck.

So there you have it! The 'Because...' part of Tint!