An ice cube, only described similar to bones found in a human body. Bone's create protection for the human organs, they are hard and therefore protect the soft tissues and such. An ice bone however, is frozen water, kind of protective of the water that it can melt into. So, it's similar to a bone both being solid/hard. One large difference between an ice bone and an actual human bone is that an ice bone is commonly found in a glass of water or soda. If you visit a friend and find an actual bone in your refreshment, you may be pals with some sort of mass murderer.
I have ice bones in my water...