On an chess server I used to play, I liked to play "wild chess" (to be pedantic, "wild chess style 3", as it has several different variants, all called 'wild chess').

The rules are as follows:

1. Pawns start in their normal position (second row for white, seventh row for black).


2. A random set of 8 chess pieces is generated, subject to the constraints that the set includes exactly one king, and no pawns.


3. This set is placed randomly on the first row for white; blacks setup mirrors white (just like in regular chess).


4. There's no castling.


5. All other rules are the same as regular chess.

In this game, it might happen that you play with three queens, or four rooks.

One might even think of a 10x8 wild variant, where the set of pieces to choose from includes the Marshall and the Cardinal. (Or even the Amazon).

See also the wildchess wiki (style 3).