My daughter's simple lunch box here consist of hard-boiled egg, sweet peas, sweet corn and chicken nuggets.
The chicken nuggets here uses the same recipe as this, except I dusted the meat with rice flour instead. You can't really see it but the egg was tinted pink and I had a hard time convincing my daughter that it's still the same hard-boiled egg she like. I actually had to 'force' her to eat a piece to let her taste it for herself. :P