These 2 packages of plastic (BPA free) spoons will change color with the temperature of the food you use them with. Be warned they are lightweight plastic, so not really made for hard ice cream. But cold soft ice cream, yogurt or puddings and you will have some fun.
There are 12 spoons per package and they are reusable and dishwasher safe but the top rack only. The hot water in a dishwasher might mess with them a bit.
The disclaimer: Color change will vary depending on temperature, lighting, and perception of color. Color change is due to temperature change. The warmer it is… the lighter the color. The colder it is… the bolder the color.