I got enthused about this challenge when it was first announced, and started looking for suitable images immediately. Now I see them everywhere, driving my husband silly (but he has started seeing them too)!
I would have liked to make all the images vertical so they looked good in the calendar view, but there are some that really suit the horizontal format and just didn't look right turned on their sides, so I'm considering doing week about.
The plan is to stick to a loose theme each week (this week - urban / architectural), and look for some fresh ones every day, but if I'm not happy with the result I'll use one I took earlier.
We'll see how it goes. I'm already enjoying the other images being entered for this challenge!