College or Collage?

Yes, definitely. College is an institution where we attend classes and learn and Collage is a collection of pictures, photo's and/or paper and fabric stuck together with glue in some kind of art form. You do not have to be an artist though hehe

It depends much on your intended sentence, If you mean education utility it's college. But if you mean photos and picture editing you must use the other one

I attended college in 1997. I have a collage of family photos.