I think a plant leasing/maintenance business is a great idea for someone who has the time, energy ... and plants! There's a company here in my town:
http://www.plantpeopleofflorid... that leases plants to offices/businesses. I worked in the mortgage office of a local savings & loan years ago and the plant company supplied the plants for the VP's office and a couple of other areas in the building. I worked for the loan data processing department but for a couple of years did double duty in the huge reception area because they couldn't seem to keep receptionists for very long (boring job!) So, we moved my computer, printer etc. out to the reception desk and I brought in many of my own plants to decorate the rather large, bland area. The owner of the plant maintenance company came by one day and stopped and complimented me on how great the reception area looked and said she wondered why they'd never "dressed" up that area before. I told her that we didn't have many visitors coming to our building; on occasion someone would come in to meet with the commercial real estate folks but I guess the upper management didn't want to spend the money for live plants in the reception area. When I transferred to another department I'd see co-workers in the break room on occasion and they'd always tell me how bare and empty the huge reception area was since I'd transferred. My little cubicle area in the new dept. was small but I still had one plant on the corner of my desk and one on top of the file cabinet and a hanging basket in the corner behind me.