Rockall. Malin. Dogger. Finisterre.

I was going to say that! A friend in a rented house with a concreted back yard even had a lawn in a plant pot. It was so small he could cut it with nail scissors. The rest of the yard was covered with flowers in pots, tomatoes in grow-bags, troughs of lettuces and anything else he could think of. He's a bit of a plant nut, though. You could get a couple of easy-to-look after plants, shove them in a pretty container with a bit of compost and get a garden with not much work at all. It's worked for me so far, and I have a dreadful record with houseplants.