Calendar Inspirations & Ideas

So our next project is a desk calendar for the Numerical Institute (a made up company :D). I have a few inspirations I found on etsy that give me an idea of what I personally like. I know I would like to represent time passing through something like a plant (kind of like the one below with the tree...) or possibly with the actual paper changing from dark to light and back to dark for the change in the amount of light we have during the day. Also, I know I would like to focus on using just illustrations and not photos, as I used photos in the last project. I would also like to have a two-for-one type of calendar in that, on one side would represent the Northern Hemisphere, including holidays and observances from around the world in JUST the Northern Hemisphere, and on the other side it would represent the Souther Hemisphere and the holidays and seasons that change in that part of the world. This way, people from around the world could potentially purchase this calendar and it would adequately and fairly represent where they live.

Here are some of my inspirations from etsy: