Something home made is always nice Hobby craft sell create your own ornaments, like cardboard ornaments, can get little ones to paint/colour or decorate the ornament, it’s sentimental, fun activity and relatively cheap (as one pack would be good for a few grandparents) x
I'm ordering photos and making a photo album of the first 2 years x
You could get them a personalised calender with all there grandchildren on different months ☺️
I’ve got grandparents a couple of photos of their grandchild in a frame. You could also do some handprint art or something crafty to get them