I am still amazed that Flor seems to be the only carpet company that has figured out that floor tiles are for more than just commercial jobs. Haute stuff, one of their new lines shows the flexibility of carpet tiles. The positive/negative look comes from two different floor tiles that are cut and spliced together. With Haute stuff, Flor is nice enough to do the work for you, but the same idea could be applied to any of their tiles.
Haute Stuff from Flor $7.43 sq/ft