We want to be able to choose the desired stone from each chess set. Lichees should offer this service.
If you're referring to changing the look of the board, or the look of the pieces, you can do that by clicking your username in the top-right corner, and clicking either the "Board theme" or "Piece set" tab, depending on what you wish to change.
Otherwise, I'm not entirely certain what you mean by that request.
It seems to me that they want to mix and match different chess set styles for each piece.