My husband and I had some color-changing mugs made with an image of a cartoon T- Rex and a baby T- Rex hatching from an egg. My three year old son loves dinosaurs so that is the reason for the T- Rex. Next to the big one we put "brothersaurus" and next to the hatching egg we put "babysaurus hatching April 2016". When cool, the mugs are black and when you put coffee (or something hot) inside they reveal the image. My husband and I were so excited about the announcement and no one got it! Geez! I thought it was a clever idea, but I guess not!