Such cool use of shapes for magazine covers by graphic artist Noma Bar. If I was making mag covers this is how I'd want to do it. I especially like the Russian and Best Books Rhetoric works. You don't need to have too many colors or go overboard with busy shapes to make effective works.
Check how the negative space and simple black and white forms Bob Dylan into the TimeIn cover. Such cool works of art related to pop culture almost always grab my attention.