Eggs or if specifically requested by the parent of thE child not to buy eggs then a small gift such as a book.
As above. We exchange eggs with our nieces and nephews but there have been a couple of years where it has all seemed too much and we vow the following year to do something a bit different - eg homemade cookies etc but never get round to it!!

My SIL's MIL gives the grandchildren winter pj's every easter instead of chocolate.