In DS9 "The Nagus", we learn that Ferengi are vacuum-dessicated after death, a process which reduces them to powder form. The powder is then packed into roughly 50 disks, which are then sold on the Ferengi Futures Exchange.
The status of a Ferengi determines the price per disk. For instance, the Grand Nagus himself, thought to be deceased in that episode, was going for 20 bars of gold-pressed latinum per disk, with a prediction that they would be worth even more down the line.
Why are the remains green?