Here's a no-brainer recipe page. Steamed vegetables are good in a bento box. The recipe I use for all of 'em is the same except where noted: cut up the vegetable, put it in the holder of your steamer, put hot water in the bottom of your steamer, and boil covered to steam the suckers until they are the right texture, which is usually about 20 minutes. Avoid overcooking, as that leads to mushy veggies, which are nobody's favorite. Some people boil vegetables,
but I find that leaches out the flavor, not to mention the vitamins.
Stuff I like to steam and put in my bento lunches:
Sugar snap peas
Japanese sweet potato (particularly if it's dry!)
Zucchini & yellow squash & carrots, all
Zucchini & yellow squash & carrots
& broccoli & mushrooms, all together
* Before or after steaming, you can cut the stems into coins
close to where they split into florets to make funky,
Laugh-In type "stars." They look cool on rice
or just by themselves.