High light spot: for colourful leaves, try the croton, but I think the environment would be too dry for it. I'd go for a yucca elephantipes, instead, or a jade plant.

Medium light spot: dracaenas are a good choice for offices, especially the green ones

For direct sunlight you could try many succulents, some cacti, but they may even need more sun than that. Peperomia, Hoyas, Snake plants, Ficus elastica and Bromeliads might do well too.

For the less bright location: Philo scandens, Aglaonema, Spider plant, snake plants and Dieffenbachia to give you some ideas. Have fun : )

Jen

For a house plant that's pretty tough, I would highly recommend a Spider Plant. (I've also heard it called an Airplane Plant.)

The Spider Plant has long, thin leaves. My mother told me that they naturally grow on cliff sides, and so they send down shoots with tiny baby plants on them to try and find more places to grow. These look very pretty, and can be trimmed off and transplanted.

It's usually recommended that you hang a Spider Plant, but they will grow just as well when not hanging. The only issue is that they might need a bit of room if you don't trim the baby plants off.

My room mate and I have had one of these plants for more than five years now, and we periodically forget to take care of it. As we speak, it has not been watered in weeks and it still looks fine. (I have best water it once I'm done posting this!) I also have a vase full of some of the cuttings that has been sitting around since Christmas and I keep forgetting to water or transplant them, but they continue to look healthy. As you can see, it's a rather hearty plant!

Here is a link that might be useful: Spider Plant on Wikipedia

Dracaena warnekii 'Lemon Lime' has cool bright green and yellow striped leaves and would work in your less bright spot. So would pothos, which comes in lots of speckled leaf combos, or Philodendron 'Brasil' which has cool green and yellow striped leaves.. Also ditto on the aglomenas and dieffenbachias as good choices. All of these like to be kept on the dry side - don't water until the top of the soil feels dry to the touch, then water well until water comes out the bottom, but don't let them sit in water for more than a few hours. If you're willing to water more often, there is a variegate peace lily (spathiphyllum 'domino') that is way cool.

For the bright light, my first choice would be a variegated Ficus elastica (rubber tree). In good light, the leaves are green with cream and get great red highlights. Crotons are colorful and like bright light, but they are so prone to spider mites that you will need to budget for new ones every year or two. You could also try a variegated ficus. Or any of the syngoniums - there are some new varieties with multicolored leaves that are fun but still a bit hard to find.

I love multicolored leaves, can you tell?!