This might be the ultimate in design nerd decor. And you have to admit it's also some pretty clever recycling. For those not in "the know," a Pantone Color Guide is the designer's go-to resource to properly match the colors they're designing with on-screen with what ultimately comes out of the printer or manufacturer. Note: they're not cheap. But they do fade with age, eventually rendering them useless for their intended purpose.
The fact is that when you've been in a creative field long enough, you'll have several old versions of the guide sitting around. I don't know many folks who replace them every year, as Pantone recommends, but if you work in a design house or advertising agency, there's bound to be a dusty old copy sitting on a shelf somewhere whose colors are slightly faded and of no use to your current or future projects. That is, unless you make this awesome clock!
(Images: gmjhowe / instructables)