Here is an example of the type of calendar I am describing:
Each month's print would be a different color and contain a theme related to that month. I also toyed around with having the colors relate to birthstones as well. All this would require a minimum of 12 screens and 24 bulbs though....ouch. And if I am going to have these ready for people to purchase by the gift-giving season, I'd have to get started pronto!