Anything 당신 want... journal entries, taking notes in class, doodling, 글쓰기 stories, songs, 또는 poems, 글쓰기 things down that 당신 don't want to forget, keep track of your 가장 좋아하는 quotes, use it to make lists, make paper airplanes... the list goes on. :)
Maybe a diary, 또는 maybe notes for school 또는 for hobbies like if 당신 write. 또는 maybe 당신 can use it to draw, that's what my cousin does. Just doodle with it. Use it to do your homework on. Anything 당신 want!