Gift recommendations for long distance grandparents

I’m taking my 1 year old to Australia for the first time in September to meet my family. My mum came to visit when he was 4 weeks old and my dad has never met him. I’m wanting to take a little personalised gift to give to my parents from my little boy, a keepsake for them as I already know the goodbyes are going to be hard for them at the end of the 3 week visit. Does anyone have any cute recommendations?