Custom Map

Hi! I'm thinking of making a custom map. problem is, ive got no ideas. please leave a comment of an idea for a custom map and ill choose the one i like best. i might leave it to be released after 1.3 comes out if i am to include anything new. and i cant make anything with spawners unless there is a dungeon near by or it is made with pig spawners. i cant use mods till september. hopefully some of u will think of ideas and how i can do it.
Cissississ