Let's face it — if you weren't into mood rings when you were younger, then you probably didn't like fun stuff. But the secret of the mood ring (spoiler alert) is in your body's temperature. Picking up where the mood ring craze left off is the InCase Thermo Snap Case ($35) that changes from dark to light, depending on the temperature. A long phone call or a handprint will make a lasting impression as the case slowly returns to room temp, but considering how much I'm on my phone, I'm looking forward to lots of color-changing opportunities.
I kinda wish the color change was more dramatic (throw some purple, green, and blue in there!), but hey — maybe version 2.0 will more closely resemble the mood rings of my past.