The theme itself explains the what types of decors should be used. Your all kitty party supplies should be in black or white. Inflate black and white balloons and spread them on the floor. You can use some white satin sheets or black satin sheets or alternate between black and white satin sheets as drapes. You can use black velvet curtains and keep rest of the decors in white. Cover the chairs with white cloth and tie black ribbon to each chair. Use black velvet table cloth and wrap white lace on it. Alternatively, go for black and white checkered tablecloth. Flowers and candles in black and white can be clubbed to form table centerpieces. Hang black and white paper lanterns around the kitty party room.