I have a rented flat with a small concrete yard, the floor is concrete and it is surrounded by 4 walls (one of which had some graffiti on), has a drain and that's about it. There is also some kind of noisy air con vent (at least that's what we think it is) and I live next to an electricity sub-station. I want to know what I can do to transform this space into a nice place. At the moment I only go out there to clean the cat litter tray out or to get the mop or broom (I keep them out there as my flat doesn't have any big enough cupboards or storage spaces indoors).

I'm thinking of getting some large containers from pound stretcher and some plants from the garden centre around the corner. The space doesn't get much light so I need plants, and preferably pretty flowery types of plant, that will grow without much sunlight. I have grown busy lizzies in my previous flat without much light so that is a starting point. Also I have a curious cat who likes nibbling plants so nothing poisonous to cats (I know lillies are and some others). Any ideas for me?