Back in '97, I believe some of the tiles they carried were from Laufen & Tile Works.
Laufen had a marbleized green tile in a series called Charleston. (Charleston Green 12x12 was one of the most popular color/size combos.) They also offered a 8x8
floor tile & a 3x3 dot. (To go with 12x12 clipped corner tile.)
It was discontinued many years ago. You could try Tile Mart in Benton Harbor, Michigan. They may still have some.
The other one was Tile Works "Passages" series, but Tile Works went bankrupt several years back. I know they had a 8x8 size for sure, I'm not 100% sure they offered a 12x12 as well. I do know that the 8x8 Laufen & Tile Works were so similiar, we ourselves had customers cross from one to the other if either was out of stock.
Both of these manufacturers were (at that time) made in the USA.
I hope this helps a little.