I always loved "mood rings" they were fun to wear,at least least for my friends because i was so cold all the time my "mood" was always cold clammy cadaver :P
But these are great, i have seen "mood beads" but nothing this fancy. too bad they are way to spendy for what they are but i would sure love to make some stuff with them.
https://www.tikaimports.com/newlayout/item.cfm?ProdCat=mpd&NumRecords=4&StartAt=1&rows=5&navitem=3