Minted offers over 70 different calling card designs including ideas for Mommy cards. I had never heard of this before but I’ve seen it a lot in my search for calling card ideas this week. I suspect Mommy cards are way for parents to share contact information with other parents for play dates, car pools and other kid-related activities. I imagine this would come in particularly handy if your children have different last names. And it sure beats trying to exchange numbers while juggling diaper bags and snacks. Fifty cards are just $35.