My current assignment is Cal. This is a program that will output a calendar using only formatted text. The user can ask for any year, and also request any square size. That is the months can be formatted to be a grid of 3x4, or 4x3, or 12x1, etc.
I am not allowed to use any array bigger than 12, so pretty much only for month names, and all work is to be done using loops. This will be an interesting project.