High School Yearbook Theme? ?

I'm in grade 11 and one of the editors on my yearbook team. Our teacher asked us each to come up with a theme. I'm looking for a specific theme, not just, memories, being together, etc. Anything that's worked for you?
My school goes from grades 7 to 12.
Thanks :)
Update: My school hosts 1400 students. It's a catholic school too so it has to be appropriate.
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