I know a number of our American readers are unreasonably warm and toasty in some kind of freakish heatwave, but those of us in the Frigid North (and, one presumes, also in some parts of the southern hemisphere) still have over a foot of snow to deal with. So forgive me, oh sufferers of 80+ degree temperatures, for sharing this awesome thing I found! (Consider it a possibility for very early start on making a Christmas list?)
These scarves, made by Becky Stern (homepage, Etsy) display elemental emission spectra. Silicon, uranium, and mercury are currently in stock, but you can also get a custom one of any other element you like, with some delay and possibly a little extra cost. (I found this applet linked from the Wikipedia page, if you want to choose an element that appeals to you. I definitely want Cobalt, no question.)