grandparent gift's

So i am having my parents first grand baby and i want to do something for them for grandparent's day or closer to when the baby is born , any idea's? i know i am gonna either buy ( i dont know where to buy shirt thats say grandmom and grandpop 2 be) or i could always make them and print out a pic of the ultraspund when i get it one the 2nd a iron on to the shirt .. anyone else have any idea's?