There are so many ways to create obentou. The main part of obentou is rice. In Japan, placing umeboshi (Japanese pickled plum) on the center of rice is the most traditional way to serve rice in obentou. Usually, rice takes about half the obentou and the other half is filled with any food of your choice. Many people likes to serve some left over dinner from the night before.
One healthy idea of making an obentou is gathering the traffic signal color; red, yellow and green.
Red: Any kind of meat
Yellow: Eggs, fruit, vegetables
Green: Vegetables and fruit
Pictures below are some ideas and examples of obentou. Obentou can be very nutritious. They also give warm hearted feelings for those who receives it.
These are some fun and creative obentou!