pink and blue baby gender reveal pinata with pink or blue confetti, candy, and trinkets inside depending on the sex of your baby - great to do if you already have a child and makes the idea of a new sibling fun.
Great gift for the older sibling of a new baby -- "Happy Big Sister Day!" I've seen this before, but I like the addition of a camera for them to take their own pictures, assuming they are old enough to get it. If a toddler, perhaps a toy camera
You can add anything to your baby registry with BabyList. Literally anything - even Etsy items, baby sitting, or an aquarium/zoo membership! It's easy, beautiful & free. BabyList works just like Pinterest. Simple enough for the grandparents-to-be too.