Let me elaborate a bit: you can only submit variants that are possible to create on the variants server. Variants including unimplemented mechanics and rules are not put under consideration.
You should only submit NCVs and WoFs that are possible to set up in the main variants server.
Bored of normal chess/Chess960? Introducing, Chess13608! Where the back row of pieces are not only shuffled, but completely random! The only restriction is that there will always be exactly two rooks, and the king is between them. Castling will be the same as Chess960.
Example starting positions: