Omar Khayyám - The Calendar of Omar Khayyám (1903)
Open Library direct link
Open Library main page
It's a day off from being usable for 2015 but still worth flipping through since we aren't likely to remember this next year. Each month gets a quatrain from the FitzGerald translation and an illustration by Blanche McManus (Louisiana born, Paris based and best known at the time for travel books co-written with her husband).