Thermochromic Spectacle Frames

Spectacle frames that changed colour when they warmed up would be kinda fun, but since I'm not Timmy Mallet I'm not that excited about big thick spectacle frames going from red to green. What I'm really talking about here is a frame which is quite inoffensive (maybe even transparent) when warm, but when you take your glasses off, the frames cool to an interesting mix of fluorescent pink and yellow stripes. This makes them much easier to find when groping blindly around the next morning. Put them on, and they warm up and turn back into a normal, mild-mannered pair of specs.

On a practical note, it would probably be better if it were just the earpieces which changed colour, and the rest of the frames can just be titanium or whatever the heck they use nowadays.