I need help with coloring my bento rice...any help?

It's pretty easy. Just boil the rice with food coloring. If you use carrots, just slice them up really tiny and cook it in the rice. You can use corn and frozen mixed veggies too. Just add them towards the end while the rice is still super wet. I've always cooked the rice with the spices while it's cooking in the pot. Once it's done, open the lid and let it dry a little then you can mold it to whatever you want to.