You can make this cute Pikachu rice ball bento box. Mix some cooked rice with egg yolks to make it yellow. Make a big rice ball for the head as shown. Make two long rice balls for the ears. Add nori seaweed details for the face and ears. Add tiny cheese circles for the eye reflections. Put a touch of ketchup for the rosy cheeks. Follow the link for more on this and other great bentos.