a quick fried rice is the obvious choice when you have some left over cooked rice on hand... just throw in some fresh and/or frozen veg and you have an instant and (so long as you add plenty of the good stuff) healthy meal in minutes!
1 cup of cooked white or brown rice
2 cups vegetables (some of my favs include diced tomato, frozen peas or sugar snap peas, button mushrooms, diced carrot, diced capsicum, bok choy, vegan bacon... and the list goes on)
heat a wok or large saute pan, add a little sesame or vegetable oil. add the vegetables and stirfry. add the rice and stirfry (getting a few brown bits will add some flavour!) add some soy sauce according to preference and you're done.