Here is a rug that we picked up a few years ago.
Hard to see in the pic but the black is separate rug material giving a 3D cut into the rug effect.

Alanb's eBay
https://www.ebay.com/sch/alanb/m.html?hash=item3a775fc2df&item=251110867679&pt=LH_DefaultDomain_0&rt=nc&_trksid=p4340.l2562