Make printable stationary together and then enjoy sitting down and sending out a personalized notecard to a friend. Consider thanking your friend for taking you out to Six Flags, or maybe for that sleep over last night.
Dress up your envelopes with address labels that have colorful images on them. Consider expressing your personality with a picture or caricature that you enjoy.

Consider engaging your child with a color your own personalized notecards that they can draw on and color in. Then they can learn how to write a thank you note inside to Grandmaw and Granpaw!
If the kids spent the weekend with Grandma and Grandpa (and you and your husband got a chance to spend some time alone), be sure that your children write a thank you note for the special time they enjoyed. You can make some childrens thank you notes on printable stationary.