The blank squares have more room for writing. I use them for unit planning, recording parent contacts, and even give them to my students for keeping track of writing workshop deadlines, book reports, etc. They look great on monthly bulletin boards and newsletters too.
The icon squares don't have much room to write, but I use those for reading logs. Students can color a picture every night they read for at least 30 minutes at home (or are read to). I've also used these in individual behavior plans too and have students color the picture if they met their daily goal.
I've uploaded the templates to my TpT store, but I'm giving them away to my first three teacher friends to leave a comment saying how you'd use the calendars in your classroom. Be sure to leave your email address so I can send you the files!