These mini desk calendars make great gifts for coworkers. I give them out every year and everyone seems to like and use them a lot. Etsy has many wonderful sellers that you can buy them from, prepackaged and ready to go. Or if you love to DIY, you can purchase templates, print them out and assemble them yourself.
The template I used this year (and last) is from Lemonade Paperie--I love the little graphics and attention to detail (like the flag on the 4th of July and the four leaf clover on St. Patrick's!)