Posted: 15/07/2016 at 16:23
Gardenings.........unfortunately I'd have to agree with all the responses above about actually growing plants.
You don't say whether your room is dull and dark or light and airy ? If the latter, the only thing that springs to mind is drying flowers, herbs and seeds. If you are able to buy the fresh flowers, herbs etc. fairly cheaply which you seem to suggest, then perhaps you could set your room up to do this.
There is a market for dried flowers and herbs but obviously you would need to look further into it - it is possible that you wouldn't be able to be competitive but it may be worth a little research.
Hope you manage to find something suitable anyway