Tired of your simple black and white stones? Here are some others you can try, if you can find them. I cannot vouch for any of these vendors.
"Exotic SemiPrecious Go Stones". Most come with a 6-8 week wait and a high price tag ($400-$600). Beautiful pictures. I cannot vouch for this vendor!
"Flower Baduk Stones". Only found on Korean trade sites like ec21, tradekorea, gotradekorea. From a company called "Dream Entry".
Four colors available in either gloss (lustrous) or matte (lusterless). Well "available" is a small stretch. I haven't found these in the US.
These seem to be sold also as "One Color Go" where a single color of matte/gloss are used for either side. My brain hurts!
If you're bored with black and white, enjoy pining after these options!