Silly Putty is one of the oldest toys still on the market — but ‘Putty Peeps’ has introduced some changes that make the classic toy even more engaging for kids today. The squishy toys come in several different colors, and paired with their goofy googly eyes, they make infinite, malleable characters for kids. The key feature of Putty Peeps is their color-changing technology. The toys come four different base colors, but those colors all brighten significantly when exposed to temperatures above 26 degrees Celsius: right around the temperature that they get heated to when gripped in the palm of one’s hand. With the colorful binary, kids have the freedom to create almost anything they can imagine.