What is/was your 6-9 month olds favourite toy? (Xmas present recommendations)

By the time Christmas is here my little man will be coming up to 6 months. I’ve already started buying a few small presents (sensory balls, Oball, bath toys, follow me ball etc.) but I’m just wondering if anyone has any other suggestions? If your 6-9 month old has a particular toy they like, I’d love to know what it is!