You change your clothes every day to suit your mood, so why not your glasses? Sure, glasses are pretty expensive, so you're not going to own a bunch of different pairs, but that's not what I'm advocating. Why not have one pair of glasses that can change to go with any outfit?
The RbG Rainbow Glasses are hollow plastic frames that you can fill with any color of water-based ink that you want. You can empty them out at the end of each day and refill them in the morning, or just leave them empty for a clear look. Too messy for you? Well, just wait for the next version, full of LED lights that you can change on the fly. We hope.