My recent bentos have also been more Japanese-inspired than before, and a big help in this regard have been Makiko Itoh´s Just Bento Cookbook as well as her recipe sites Just Bento and Just Hungry.
~ Japanese white rice with (heirloom) carrot-sesame furikake
~ Sauteed mushrooms, onion and (heirloom) carrot in teriyaki sauce
~ Yellow pepper kinpira*
~ Pickled ginger
Not to bad for a first try in ages, if I do say so myself :-)
* Just Bento Cookbook recipe