Silky black fur, some catfood on his whiskers, and, uh, catnip. And he was just rolling on the floor, so add in some dust.

Bwah--sounds almost exactly like Bo this morning. He had food in his whiskers, dust all over him, and he had just eating something unidentifiable from off the floor when he sauntered over to us with that "pet me before you go-go!" look, and we were like, "EW, no!" Yes, we're cruel.