Good points and suggestions presented by all, this looks promising. Some suggestions from me:
Mythology month: everything mythological for 4 weeks, from Medusa being turned to stone, Hercules slicing up the Hydra, Odysseus vs Cyclops, King Arthur pulling the sword from the stone etc.
I remember there used to be a random activity of the week, it's been years since I've seen it done before. For ex. 'robot monkey throws damsel off of a flying ship' Extremely random but broad and open to imaginative interpretation. Great exercise to work out your spontaneity muscles. (prepare for client's demands?)
All I've got for now, good luck!
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New World Creation: Designers Wanted – Environment of the Week