This charming calendar and flowerpot from Nothing Design Group is a great concept, and would make a very easy DIY. Instead of having just an image of a flower, why not use an actual flower? The elongated shape of the calendar is designed to provide the backdrop for the flower, while the calendar dates below form the shape of a vase...

These calendars are only available in Korea (via Storyshop or 1300K), which is another good reason to attempt a DIY. We've been looking for a good calendar, so this might just be our next rainy day project...

Via Grassrootsmodern