'You say you've got no space for a salad garden?'
Then how about this idea?
I saw this posted elsewhere and just had to pass it along. I'm assuming it's a shoe organizer, the kind you can get at Wally world for under $10.
I also assume it's just been planted with purchased plants, and I think (small as those pockets usually are) that you'd have to really stay on top of watering during the summer.
But it's defintiely a cool way to "grow vertical" on a small budget!