I've seen a few posts lately that mention staging rental properties, and how effective it can be to help rent these units faster. Having had many years in the Property Management Industry, let me say 3 little words...
Jump on this!
While I believe you would find more success targeting luxury high-rise apartment communities vs. the single property landlord, this is an area that I think will soon take off. It might be difficult at first to locate a landlord or property manager that currently needs your expertise, but I believe it could pay off for you.
Many of the luxury high-rise communities actually have more than one model apartment, and I can't tell you how many I've seen that have very 90's, dated, boring decor. With the real estate market in flux like it is right now, Property Managers are looking for a way to bring people in, and stand out from the crowd. Even offering inexpensive consultations on ways to bring the model up to date, and give it some more memorable character might give you an "in" for when they are ready to fully redo it. And I wouldn't be surprised if a full project came sooner, rather than later once they see how effective a memorable model is at bringing in renters. And having some great pictures for advertising is just an added bonus!
I'd love to hear from anyone that has already done work like this, and how it has gone for you.
Best of luck!