Greetings From - Initial Struggles

The new brief is to create a series of four postcards from different places around the world, each linking in some way yet each with their own individual look. We have to use vectors and illustrator to create these. I'm REALLY panicking because i have NO ideas on what to do the postcards about and also I find myself really struggling with making purely shape driven work which is basically what this project is. I don't know what I am going to do yet, I'm hoping that through researching random cities and events around the world I will be able to discover an idea, but so far, no luck and no inspiration.