Hi, everyone! I'm Japanese(I live in United States now but, I was born in Japan and grew up there.) and I used to take Obento to my school lunch, my office lunch almosst everyday. My mom used to make them for me every morning. And now, I'm making Obento for my husband and my daugher(soon my son too!). My daugher has a Hello Kitty Obento box from Japan.(My mom sent it to her for her Birth day.) You can put whatever you want in their Obento box as long as they love them. Because this is for fun for yourself and for your loving one, and hard to find Japanese food around here in NE PA. About spam musubi, I heard this food is very famous in Hawaii, but you hardly see it in Japan. Anyway, I'm sooooo happy to see everyone here is interested in Japanese Obento and make it for your loving one. (I'm sorry if you hard to understand my english since I'm Japanese. English is my second language.)