We have hosted Disciple Now weekends in our home several times over the years. The last group we hosted was college age young men. They were so sweet and polite.
They left us with such a sweet gift. They bought one of those Christian spiral flip calendars and each of them picked a day (maybe their birthdays?) and wrote a little thank you note. Now as we go through the year and I turn the pages on the calendar I come across notes that they wrote. It brings a smile to my face over and over and it's something that I will use year round.
This would be a fantastic hostess gift or Christmas gift. You could have your kids write little notes to Grandma for her to find throughout the year. She'll love it and it's inexpensive too! :)