Balcony interior or exterior? It'd be difficult to determine that limit between "in" and "ex"... Indeed a balcony is such a place where nature can be brought inside and vise verca. Due to the fact that the weather pampers with its summer warmth, I think it's high time to plant the balconies and create a cozy corner. Probably open balconies would better fit to make a garden. I have collected the small balcony samples on purpose - I think that a lot of people cannot boast of a big balcony.
I have noticed that in Scandinavia there're rather a lot of small balconies which people equip indeed tastefully and cozily - though only small tables with one or two chairs can be accommodated, however, the plants give some life and please the eye. I also have collected some ideas how to purposefully use the space that you have.