My guineas are fat and healthy. I feel guilty because I know they love the grass and getting out of their cage, but either because of time or my own laziness (I live on the fourth floor), we often don't.
One doesn't have to be settled to have an herb garden. All you need is a long box (available at most home depos or lowes for about $6 or $7), some dirt (I recommend the new Organic blend by MiracleGrow), either some seeds or whatever the nursery has available, and a sunny window. Place dirt in box (1 or 1/2 inch from the top), then either put seeds according to package or pre-grown herbs into box. Water. Place next to sunny window. Water accordingly thereafter (whenever the dirt is dry to the touch).
In mine, I have Greek oregano, sage, basil, and rosemary. On my balcony (in seperate containors), I have lavendar and mint. In a smaller pot on a window sill, I have chili pepper growing (which I broke upon planting, but some how it's still thriving, knock on wood).
As long as one has a sunny window, a containor, and some dirt, pretty much anything can be grown.