What is a good recipe for rice balls for bento box?

My niece loves her lunches made the Japanese way. I thought that this would give her some fun. make her some Japanese rice balls for her bento box. Can anyone help me out?What is a good recipe for rice balls for bento box?
Japanese children also like cute or unique rice balls in thier bento box.

The most famous and simple ways to decolate the rice balls are below:



鈽匘ecolate with laver and so on

Cut the laver or the slice of ham with your scissors and put it on the rice balls.

It's one of the example.

http://cookpad.com/recipe/698217



鈽匔oloring the rice balls with ketchup or omelet

Mix the rice with ketcup before you make the rice balls,

and shape the rice like heart:)

http://cookpad.com/recipe/451401