i only have some bad pictures of a Maxxis brochure from 1996, including also the Instinct and Gluteus.
Most of the offered models had been available in different color variants,
with different color combinations for the rubber compount
and in addition also for a stripe
I would assume yours are rare, to rare to find some more similar ones.
BTW: I do have a set of amberwall Maxxis of roughly that generation, without a name just a product code, and running a combination of Helter and Skelter tires on one of my bikes. The latter ones are pretty hard meanwhile, but I do like the style and sure, the name, and both sets do last quite long without getting porous or brittle.